How much protein, and when: the experts' practical targets compared

The Short Version

On the daily total, the experts converge: Gabrielle Lyon recommends about one gram of protein per pound of ideal body weight [1], Layne Norton recommends about one gram per pound of body weight or ideal body weight [2], and Andy Galpin sets one gram per pound or more as the floor during recovery, saying going high is fine but going low is not [3]. All of them treat the official RDA of 0.8 grams per kilogram as a deficiency minimum rather than a target [1]. The real disagreement is about how much timing and distribution matter. Lyon builds her plan around hitting a 30 to 50 gram threshold per meal, especially at the first meal of the day, and discourages fasting in older adults [1], while Norton calls total daily protein by far the biggest lever and puts distribution at perhaps the last 5 to 10 percent [2], and Galpin says the post-workout window is real but not a strict 30-minute deadline [3]. Huberman's AMA preview doesn't cover protein amounts at all, but its advice to stop eating a couple of hours before bed sits alongside Lyon's view that the final meal supports overnight protein synthesis [1][4].

Table of contents

What They Said

The numbers side by side

Before the detail, here is how the figures line up across the sources.

Question	Gabrielle Lyon [1]	Layne Norton [2]	Andy Galpin [3]
Daily target	~1 g per lb of ideal body weight; 0.7 g/lb acceptable	~1 g per lb of body weight or ideal body weight	1 g per lb or more in the remodeling phase; high is fine, low is not
Per meal	30 to 50 g of high-quality protein to hit the leucine threshold	His own practice: about 50 g per meal, 4 to 5 meals	No per-meal figure given
Around hard training	Shake within about an hour for older or at-risk people	Protein-rich meal within a couple of hours	About a quarter of body weight in grams (50 g for a 200 lb person), with carbs
Distribution	Even distribution, first meal most important	Last 5 to 10 percent of the effect	Daily total matters more than timing
Fasting	Not her go-to for older adults or people struggling to gain muscle	Can build muscle on 16:8, but he'd avoid it for maximal gains	Fasted training can work; waiting 3 to 4 hours to eat afterward is probably fine if protein is adequate

Gabrielle Lyon: hit the threshold, starting with the first meal

Lyon, a physician trained in geriatrics and nutritional sciences, frames protein through her central idea that muscle is the organ of longevity [1]. Skeletal muscle, she says, is a nutrient-sensing organ especially sensitive to the essential amino acid leucine; when a meal contains enough leucine, it triggers muscle protein synthesis, which researchers use as a proxy for muscle health [1]. That threshold, in her account, is reached at roughly 30 to 50 grams of high-quality protein per meal, and below it the meal does not stimulate muscle in a way that matters for outcomes like sarcopenia, body composition and obesity prevention [1]. In food terms, 30 grams is about a four to four-and-a-half ounce steak, roughly six eggs, or a 25-gram whey shake [1].

The daily figure. Asked what she'd do with a magic wand, Lyon's target is one gram of protein per pound of ideal body weight, so a 200-pound person who wants to weigh 150 would eat toward 150 grams [1]. When she summarized her top tools, she added that "an individual could certainly go to 0.7 grams per pound ideal body weight" [1]. She is blunt about the official guideline: the RDA of 0.8 grams per kilogram (0.37 grams per pound) is a minimum to prevent deficiency, based on nitrogen balance studies, and hasn't changed since the 1980s; for a 115-pound woman it works out to only about 45 grams a day [1]. The RDA for leucine is 2.7 grams per day, while she says the evidence supports two to three times that, closer to 9 grams [1]. She also says there is no evidence a higher protein diet harms kidney or bone health, and that 0.8 grams per kilogram is itself a low protein diet [1].

The first meal. Lyon considers the first meal of the day the most important [1]. In her words, "when you get between 40 and 50 grams of protein, that first meal of the day, you stimulate muscle protein synthesis," and she describes the first meal as having "between 30 to 50 grams of dietary protein" [1]. Beyond stimulating muscle, that meal improves satiety by releasing gut peptides such as GLP-1 [1]. She cites research from Heather Leidy's lab in which adolescents given 30 to 40 grams of protein at breakfast were less likely to choose foods like donuts later in the day [1]. For young, healthy people, when that first meal happens doesn't matter much; from around the 60s, she says, continuing to fast may be negative for muscle health [1]. As she put it, "An individual who is older or struggling to put on muscle fasting would not be my primary go-to" [1]. The two benefits she does see from fasting are calorie restriction and bowel rest [1].

What happens after the first meal. Huberman asked how far apart protein feedings need to be. Lyon's honest answer was that "The first meal of the day is the meal that has been studied," and that to her knowledge no study shows anything specific about the second or third meal [1]. She explained that "The muscle protein synthetic response will last two hours," though other initiation factors downstream of mTOR maintain themselves for another four to five hours [1]. So in her view "that second meal would be just about getting your protein in" to reach the daily target, while "that final meal before you go into a fast would be what we would say would support overnight protein synthesis" [1].

Age changes the threshold. Lyon explains that muscle protein synthesis has four inputs: resistance training, energy, hormones like insulin and growth hormone, and leucine [1]. Young people, driven by anabolic hormones, respond even to 5 to 15 grams of protein, while older adults rely more on leucine and resistance training and need 30 to 50 grams per meal to get a response [1]. She says 40% of women over 60 eat below the RDA, and cites the PROT-AGE position paper from around 2010 calling for more protein in older adults [1]. For older or at-risk people, she recommends protein, ideally a fast-absorbing shake, within about an hour of training [1].

Quality. Protein quality is defined by amino acid composition; animal proteins like eggs, whey, beef and poultry resemble human muscle [1]. Plant proteins can meet muscle needs if the total is high enough, but usually come with carbohydrates attached: six cups of quinoa equal one small chicken breast in amino acid terms [1]. Someone eating plant-based would need closer to 1.6 grams per kilogram of total protein [1]. She cites a study from Luc van Loon's lab in which a 40-gram mixed meal with animal protein stimulated muscle protein synthesis while a comparable plant-only meal did not, possibly because of slower absorption and fiber [1]. Her takeaway: if you're picking from the 30 to 50 range with a mixed meal, "I would certainly go towards that higher end" [1]. At the same time, she ranks quantity first: "The higher the protein, the less it matters the quality," with total amount at the base of her hierarchy, then quality, then distribution [1]. She cautions against leucine alone, since leucine, isoleucine and valine work together, and uses essential amino acids only to top up a meal that falls short [1]. Collagen, which she takes in coffee, does nothing for muscle in her view [1].

The studies behind her numbers. Lyon trained in Don Layman's lab at the University of Illinois, where Layne Norton was a labmate [1]. In a 12-month study of 130 overweight adults, both groups ate 500 calories below maintenance. One followed a food-pyramid pattern with RDA-level protein eaten mostly at dinner (about 10 grams at breakfast, 15 at lunch, 45 at dinner); the other spread protein evenly, with 45 grams at breakfast and 35 each at lunch and dinner [1]. Everyone lost weight, but the higher protein group lost 24% more, including 16 pounds of fat versus 11, and lean mass made up 26% of weight lost versus 34% in the standard group [1]. Her conclusion was that protein had a sparing effect on muscle [1]. In a second, 16-week study of 48 peri- and postmenopausal women, those eating 1.6 grams per kilogram (which she converts to 0.7 grams per pound) plus modest exercise lost 46% more body weight and 60% more fat, and 40% less fat-free mass, than the low protein plus exercise group [1].

Why protein matters for weight. About 20% (some studies say up to 30%) of protein's energy is used in processing it, compared with around 3% for fat and 5 to 10% for carbohydrates [1]. Protein triggers only about 20% of the insulin response of the same amount of carbohydrate, and the 30 to 40 gram dose that stimulates muscle is also the amount that meaningfully raises GLP-1 [1].

On cancer and mTOR. Lyon calls the claim that more dietary protein causes cancer "a very myopic thought process," since by that logic resistance training, which also stimulates mTOR, would cause cancer [1]. She notes obesity is a major cancer risk factor and a protein-forward diet improves body composition, though she cautions that loading extra protein while not moving is not a good idea [1].

Layne Norton: total protein first, distribution last

Norton, who trained in biochemistry and nutritional sciences and competes at world level in powerlifting, came out of the same lab as Lyon, with Don Layman as his PhD advisor [2]. His research background gives him a specific view of per-meal protein.

The muscle-full effect. In one of his graduate experiments, muscle protein synthesis after a meal peaked at about 90 minutes and returned to baseline by three hours, even though blood leucine and mTOR signaling stayed elevated [2]. This refractory response, which another lab called the muscle-full effect, suggests that once synthesis is triggered it runs its course; his lab found declining cellular energy might partly explain it [2]. That finding lines up closely with Lyon's two-hour figure [1][2].

Challenging the old ceiling. Norton mentions a recent study by Jorn Trommelen that found far more of a 100-gram protein dose was used than the old 30-gram-per-meal ceiling would suggest, though he says he doesn't change his views based on single studies [2]. He suspects protein synthesis doesn't truly max out but keeps rising in smaller increments [2].

Distribution is the last 5 to 10 percent. His bottom line is that total daily protein is by far the biggest lever, and distribution may account for the last 5 to 10 percent [2]. In rats fed the same diet, spreading protein evenly produced about 5 to 10 percent more hind-limb muscle over 11 weeks than loading it into the last meal [2]. Human studies of 16:8 intermittent fasting with resistance training and three high-protein meals found no difference in lean mass gain [2]. So you can absolutely build muscle while intermittent fasting, but for someone chasing maximal muscle and strength he'd avoid it; more extreme approaches like alternate-day fasting lost more lean mass in one study [2].

His own numbers. Norton eats four to five meals with about 50 grams of protein each, around 235 grams a day, and recommends about one gram of protein per pound of body weight, or ideal body weight, as a practical target [2]. He notes that protein also supports muscle quality through remodeling, and reassures listeners, especially women, that getting too muscular is very unlikely without drugs or exceptional genetics [2]. After training, he prioritizes a protein-rich meal within a couple of hours [2].

Quality and collagen. Norton explains that collagen is the lowest-leucine protein, about 2 percent, versus 11 to 13 percent for whey, and a strong study found collagen didn't boost connective tissue synthesis more than whey [2]. He isn't recommending people spend money on collagen for skin yet, but won't call it nonsense because it is about a third glycine [2].

GLP-1 drugs. Norton notes that 30 to 40 percent of weight lost on GLP-1 drugs is lean mass, similar to dieting without exercise, which resistance training and protein can help address [2].

Why he emphasizes totals. His broader philosophy is to focus on the big rocks, total calories, enough protein, fiber, consistent training and sleep, rather than obsessing over timing; as he puts it, "don't drop the big rocks trying to pick up pebbles" [2]. He's similarly unconvinced that carbohydrate timing matters, saying to eat carbs whenever you feel best [2].

Andy Galpin: protein around training, but daily totals drive growth

Galpin, a kinesiology professor at Cal State Fullerton, approaches protein as a coach fueling training and recovery [3].

Daily totals over timing. He says that "In terms of macro nutrients, the total amount throughout the day is more important generally than the timing of them," which is why you can eat a lot of carbohydrate at night, skip breakfast, lift the next morning and be fine [3]. For protein specifically, the daily total is the bigger driver of muscle growth [3].

Around hard sessions. For hard training, his starting target around a session is about half a gram of carbohydrate per pound of body weight, and for protein, "Protein is about half of that. So it's about a quarter of your body weight" [3]. For a 200-pound person, that's 100 grams of carbs and 50 grams of protein, and it "doesn't necessarily have to be before or during or after" [3]. He adjusts carbohydrates to the session, moving toward a one-to-one carb-to-protein ratio for easier sessions and three- or four-to-one for hotter, harder ones [3].

The anabolic window. Asked whether the anabolic window is a myth, Galpin says, "The post-exercise anabolic window is extremely real," in the sense that you are hypersensitive to nutrients afterward and it matters to rehydrate, replenish glycogen and rebuild tissue quickly [3]. But "It's not real though in the sense that you have to have it within 30 minutes. In the case of protein as we talked about a second ago, your total protein intake throughout the day is more important" [3]. Timing matters more for carbohydrate, especially if you train multiple times a day [3]. Waiting three to four hours to eat after fasted training is probably fine if total protein is adequate [3].

Recovery phase. In the remodeling stage of healing, he recommends raising calories by about 10 percent and keeping protein at one gram per pound or more [3]. His phrasing is emphatic: the only specific number to watch is protein, and "if you go a little bit high or even a lot high, it's totally fine. Just don't go low" [3].

Amino acid supplements. Branched-chain amino acids are unnecessary if protein intake is adequate; if total protein falls short, "going to an essential amino acid would be my first step rather than a BCAA" [3]. He does sometimes use essential amino acids around training and says adding them "wouldn't hurt anything and may potentially help slightly" [3]. If you can't use whey, he says there are plenty of high-quality vegan proteins [3].

Huberman's AMA: what it does and doesn't cover

The AMA #2 source lists optimal protein intake among the questions in the full premium episode, but the public preview covers only a sleep question; the protein answer is not part of it [4]. So this source gives no daily or per-meal protein numbers. What it does add is timing context. Huberman explains that slow-wave sleep, concentrated in the first half of the night, is when the body releases most of its nightly growth hormone, which supports protein synthesis and muscle repair [4]. He recommends avoiding food for about two hours before sleep to increase early-night growth hormone release, and three to four hours if you can still fall asleep easily [4]. But he stresses that going to bed too hungry can ruin sleep, so a small snack is fine: "it's better to make sure that you're getting to sleep than it is to avoid food" [4]. He typically eats dinner between 6 and 8 p.m. and sleeps between 10 and 11 p.m. [4].

Where They Agree, and Where They Don't

Agreement on the daily total. All three experts land at or near one gram per pound. Lyon specifies ideal body weight and allows 0.7 grams per pound [1]; Norton says body weight or ideal body weight [2]; Galpin says one gram per pound or more, and not lower [3]. Lyon's plant-based figure of 1.6 grams per kilogram equals 0.7 grams per pound [1], which is also the protein level in her menopausal women study [1]. So the useful range across the sources is roughly 0.7 to 1 gram per pound, with Galpin and Norton comfortable going higher [2][3]. None of them treats the RDA as a target [1].

Agreement that more is safe for healthy people. Lyon says there's no evidence higher protein harms kidneys or bones [1], and Galpin says going a lot high is totally fine [3]. Norton eats about 235 grams a day himself [2].

Agreement on the rough per-meal size. Lyon's threshold is 30 to 50 grams [1]; Norton eats about 50 grams per meal [2]; Galpin's peri-workout protein for a 200-pound person is 50 grams [3]. Even where they differ on why, the practical meal size overlaps.

Agreement on the timing of synthesis. Lyon says the synthetic response lasts about two hours [1]; Norton's experiments found a peak at 90 minutes and a return to baseline by three hours [2].

Agreement on amino acid supplements. Both Lyon and Galpin prefer essential amino acids over leucine or BCAAs alone, and only to top up a shortfall [1][3].

The real disagreement: does distribution matter? This is the heart of the debate.

• Lyon's plan is built on per-meal thresholds, an evenly distributed pattern and a strong first meal [1]. She cites the Layman trial, in which the evenly distributed group spared more lean mass [1].
• Norton ranks distribution as the last 5 to 10 percent and points to human intermittent fasting studies showing no difference in lean mass gain when total protein was adequate [2].
• Galpin sides with totals, saying daily intake is the bigger driver of muscle growth [3].

It's worth looking closely at the evidence Lyon cites. In the Layman trial, the standard group ate about 70 grams across three meals (10, 15 and 45), while the higher protein group ate about 115 (45, 35 and 35) [1]. So that study changed both the total and the distribution at once, which fits both Lyon's reading and Norton's emphasis on totals. Lyon herself ranks total protein first in her hierarchy, above quality and then distribution [1], so the gap between the two is narrower than it first appears: both put total first, and they differ on how much weight to give distribution after that.

Disagreement on fasting. Lyon would not use fasting for older adults or people struggling to build muscle [1]. Norton says muscle can be built on 16:8, though he'd avoid it for maximal results [2]. Galpin says fasted training can work, though he can't think of a case where it improves performance [3]. The differences partly reflect their audiences: Lyon's focus on aging patients, where anabolic resistance makes each meal count more [1], versus Norton's and Galpin's focus on trained, healthy people [2][3].

Disagreement on the per-meal ceiling. Lyon's threshold model implies meals below 30 grams don't matter much for muscle [1]. Norton cites evidence that a 100-gram dose was used more fully than the old 30-gram ceiling suggested, and suspects synthesis keeps rising in smaller increments [2]. Lyon's own 30 to 50 range already goes above 30, and she advises the higher end for mixed meals [1].

Tension on the last meal. Lyon says the final meal before an overnight fast supports overnight protein synthesis [1]. Huberman advises finishing food about two hours before bed, and ideally three to four, for deeper slow-wave sleep and more growth hormone, while not going to bed hungry [4]. These don't contradict each other outright, since a last meal two to three hours before bed satisfies both, but they pull in slightly different directions.

Quality. Lyon stresses animal protein quality and the van Loon plant-meal result [1], while noting that quality matters less as total protein rises [1]. Norton's collagen point, about 2 percent leucine versus 11 to 13 percent for whey, supports her view that collagen won't do much for muscle [1][2]. Galpin notes there are plenty of high-quality vegan proteins [3].

Why It Works

Leucine as the trigger. Lyon explains that muscle senses leucine, and a meal must reach a threshold concentration in the blood to switch on muscle protein synthesis [1]. Mixed meals slow absorption, which is why quality and dose matter more when protein comes with fiber and other foods [1].

A refractory period. Norton's experiments show synthesis peaks and falls back within about three hours even while leucine stays high, the muscle-full effect, possibly because cellular energy declines [2]. That's the mechanism behind spacing meals, and also why a single large dose may have diminishing, but not zero, returns [2].

Anabolic resistance with age. Young people are driven by anabolic hormones and respond to 5 to 15 grams, while older adults depend more on leucine and resistance training and need 30 to 50 grams per meal [1]. The body turns over about 300 grams of protein a day, with muscle about 25% of that, and turnover becomes less efficient with age [1].

Protein spares muscle in a deficit. The Layman studies suggest higher protein, especially combined with simple exercise, shifts weight loss toward fat and away from lean tissue [1]. Norton's point about GLP-1 drugs losing 30 to 40 percent lean mass without exercise underlines the same logic [2].

Satiety and thermic effect. Protein costs about 20 to 30% of its energy to process [1], raises GLP-1 at the same 30 to 40 gram dose that stimulates muscle [1], and triggers much less insulin than carbohydrate [1].

Post-exercise sensitivity. After training you're more sensitive to nutrients, which is why Galpin calls the window real while insisting daily totals still dominate [3].

Sleep and repair. Growth hormone released during slow-wave sleep supports protein synthesis and muscle repair [4], which is why the last meal and bedtime interact.

Where It Applies, and Where It Doesn't

Where the one-gram target applies. It fits people training for muscle, dieters trying to preserve lean mass, older adults fighting sarcopenia, and anyone recovering from injury [1][2][3]. Lyon specifies ideal body weight, which matters for people carrying extra fat [1].

Where distribution matters most. The case for per-meal thresholds and a strong first meal is strongest for older adults, whose muscle needs more protein per meal to respond, and for anyone struggling to build muscle [1]. For young, healthy people, Lyon herself says the timing of the first meal matters little [1], and Norton's data suggest distribution is a small refinement for them [2].

Where timing matters for training. Galpin says timing matters most for carbohydrate when you train daily or twice a day, and less for protein [3]. A strict 30-minute post-workout deadline is not needed [3].

Where the evidence is thin. Lyon acknowledges that only the first meal has been studied, not the second or third [1]. Norton emphasizes not changing views based on single studies, including the 100-gram result [2]. The protein portion of Huberman's AMA isn't in the available preview, so it can't settle any of these questions [4].

Where caution applies. Lyon warns against loading protein while staying inactive [1]. Plant-based eaters need more total protein and should watch B12, zinc and iron as they age [1]. Anyone with kidney disease or other medical conditions should set protein targets with their doctor or a registered dietitian rather than from general guidance.

What To Do With It

1. Set a daily target of roughly 0.7 to 1 gram per pound. Use ideal body weight if you carry extra fat, as Lyon suggests [1], or body weight if you're lean, as Norton allows [2]. Don't go below it during injury recovery [3].
2. Build meals of about 30 to 50 grams. That's roughly a four-ounce steak, about six eggs, or a whey shake for the low end [1]. Go toward the higher end for mixed or plant-heavy meals [1]. Norton's own pattern is about 50 grams per meal [2].
3. Make the first meal count, especially past 60. Aim for 30 to 50 grams at the first meal [1], and think twice about extended fasting if you're older or struggling to build muscle [1].
4. Space meals by at least a few hours. Synthesis peaks around 90 minutes to two hours and returns to baseline by about three hours [1][2]. Four or five meals, as Norton eats, or three solid meals both work [2].
5. Treat the rest as fine-tuning. If you prefer 16:8 eating, you can still build muscle as long as total protein is adequate [2]. Distribution is the last 5 to 10 percent [2].
6. Eat around hard training, without a stopwatch. For hard sessions, aim for protein of about a quarter of your body weight in grams, plus carbs, somewhere around the session [3]. Get a protein-rich meal within a couple of hours [2], and within about an hour if you're older [1].
7. Choose quality protein. Favor eggs, whey, meat and poultry, or rice-pea blends if you're plant-based, and aim higher on total protein if you eat plant-based [1]. Don't count collagen toward muscle-building protein [1][2].
8. Fill gaps with essential amino acids, not leucine or BCAAs alone [1][3].
9. Time the last meal around sleep. Finish eating about two to three hours before bed to protect slow-wave sleep and growth hormone, but don't go to bed hungry [4], and make that last meal protein-rich to support overnight synthesis [1].
10. Pair protein with resistance training. The biggest effects in Lyon's studies came from protein plus even modest exercise [1], and she warns that extra protein without movement isn't a good idea [1].

Sources

1. How to Exercise & Eat for Optimal Health & Longevity · Huberman Lab
2. Dr Layne Norton Tools For Nutrition Fitness · Huberman Lab
3. Dr. Andy Galpin: Optimal Nutrition & Supplementation for Fitness · Huberman Lab
4. AMA #2: Improve Sleep, Reduce Sugar Cravings, Optimal Protein Intake, Stretching Frequency & More · Huberman Lab