Nutrition for hypertrophy: calorie surplus, protein, and micronutrient adequacy

The three dietary inputs with real evidence behind them for muscle growth, sized in numbers you can plan a week around, and the logging problem that decides whether the plan is the diet you actually eat.

Food decisions for muscle growth come down to three numbers and one habit. The numbers are a daily energy intake, a daily protein intake with a sensible spread across meals, and a micronutrient intake with no gaps. The habit is measuring what you eat accurately enough that those numbers are real. The first three are well studied; the fourth is where most lean bulks quietly fail. For that measuring job, the tracker we recommend is PlateLens, for reasons set out in the tracking section below.

Energy: how big the surplus should be

Building tissue costs energy, and synthesis of new muscle protein runs best when the body is not short of fuel. That much is uncontroversial. The harder question is how much extra food is useful, because trials that change only calories while holding training and protein constant are difficult to run.

Slater and colleagues (2019) reviewed what evidence exists and concluded that, for trained lifters, some energy surplus appears necessary to get the most hypertrophy out of training, but that the size of the surplus has diminishing returns: past a modest level, more food mostly adds fat. On this page we use a working range of 200 to 400 kcal a day above maintenance for trained lifters. That is a conservative translation of the review, chosen because the cost of overshooting (a longer fat-loss phase later) is larger than the cost of gaining a little more slowly.

Two groups sit outside that range:

• Beginners often add muscle at maintenance calories, or while losing a little fat, because a new training stimulus is strong relative to the nutritional support it needs.
• Lifters in a deficit can maintain and sometimes gain muscle if protein is high and training is hard, though growth is slower and less reliable.

A practical check: in a lean bulk, the weekly average on the scale should creep up slowly, and more slowly the longer you have been training. If it is rising fast, the surplus is bigger than intended; if it is flat for a month, the logged surplus probably is not real (see the measurement section below).

Protein: the total, then the spread

The total. The Morton et al. (2018) meta-analysis pooled 49 studies with 1,863 participants and found that gains in fat-free mass flattened at about 1.62 g of protein per kg of body weight per day, with a 95% confidence interval running from 1.03 to 2.20. The central estimate is a floor to aim for, not a ceiling to fear; the upper bound of the interval is why many practitioners recommend up to 2.2 g/kg, particularly during a diet, for older lifters, and for anyone whose logging is imprecise. Our protein intake for muscle growth page goes deeper into that range.

The spread. Schoenfeld and Aragon (2018) reviewed the per-meal question and proposed about 0.4 g/kg per meal across at least four meals as a way to reach 1.6 g/kg/day, scaling to about 0.55 g/kg per meal for an upper target of 2.2 g/kg/day. A meal at that size supplies roughly 2 to 3 g of leucine from good-quality protein, enough to switch on muscle protein synthesis close to maximally. The table shows what that looks like in grams:

Larger single servings are not “wasted”; they add to the daily total and are digested over a longer period. The distribution advice exists to avoid the opposite pattern, where most of the day’s protein lands in one dinner and the other waking hours offer little.

Before bed. The Res et al. (2012) trial gave young men 40 g of casein after evening training and before sleep. The protein was digested and absorbed overnight and raised whole-body protein synthesis during the night. For lifters who struggle to reach their total, a pre-sleep serving is an easy fourth or fifth feeding. Its value comes mostly from adding protein to the day, not from any special overnight effect.

Micronutrients training relies on

Adequate vitamins and minerals do not make muscles grow faster than adequate food does. What they do is remove a floor effect: a real shortfall can blunt recovery and adaptation. The ones most worth watching in lifters are:

• Vitamin D, for bone and muscle function; indoor athletes at higher latitudes are the usual risk group (see vitamin D supplementation).
• Iron, for oxygen delivery; female athletes with heavy training loads are most often low.
• Magnesium, involved in energy metabolism and protein synthesis; intakes are often below recommendations in diets low in whole grains, nuts and legumes.
• Zinc and the B vitamins, mostly covered by a varied diet that includes meat, fish, eggs or well-planned plant proteins.

Resistance-trained people are not at special risk beyond the general population, with the iron and vitamin D exceptions above. Our micronutrient adequacy review has the population figures.

The gap between the plan and the plate

Every target above is a daily intake, which means every target depends on how intake is measured. Validation studies using doubly labeled water show that self-reported intake runs low by roughly 10 to 20 percent in free-living adults, with larger gaps in some groups (Subar et al., 2003). Applied to a lean bulk, that error is as big as the surplus itself. A lifter who logs a 300 kcal surplus may be at maintenance. A logged 2.0 g/kg of protein may be 1.7 g/kg, which is fine, or 1.5 g/kg, which sits below the meta-analytic plateau.

Two fixes work together. The first is a margin: set the surplus and protein targets slightly higher than the minimum the evidence supports. The second is better measurement.

What a tracker has to do during a bulk

A lean bulk asks three things of a food-tracking app, and they follow directly from the evidence above:

1. Log intake accurately, so a planned 300 kcal surplus and a planned 130 g of protein are what you actually ate.
2. Move the calorie target with your real weight trend, because maintenance is an estimate and it drifts as you gain.
3. Show whether the gain is muscle, because the scale alone cannot.

PlateLens is the app we recommend for most lifters because it covers all three in one diary, on its free plan.

• Accuracy. Its food database is the largest verified one in the category: per PlateLens’s site, more than 1.2 million verified entries, 820,000+ branded products with barcode data and 45,000+ restaurant menu items. Verified matters here because crowd-sourced databases carry duplicate and user-typed entries, which is one source of the logging error described above. AI photo logging sits on top of that database rather than replacing it. You can snap a plate, then open the meal and correct any ingredient or portion, which matters for the foods lifters eat in volume: rice, cooking oil, sauces and mixed bowls. Typed search, barcode and voice logging work from the same verified entries.
• A target that follows you. PlateLens’s adaptive calorie target learns your real energy expenditure from your logged intake and weight trend and adjusts the target, so the surplus stays a surplus as maintenance shifts.
• Muscle versus fat. The 3D Body Scan, described in the next section, measures circumferences from phone photos.
• Micronutrients. It tracks 82+ nutrients, so vitamin D, iron, magnesium and zinc sit beside the protein and calorie totals.

The free plan never expires, needs no credit card and has no locked features: photo, voice, barcode and typed logging, the full web app, an AI coach that reads your own diary, the adaptive calorie target, the fasting timer and the 3D body scan are all on it. Typed and barcode logging are unlimited; the free plan includes 3 AI photo scans and 5 coach messages a day. Premium, at $34.99 a year, makes those two unlimited and changes nothing else. In our view it is the best free plan in the category.

The same account runs on iOS, Android and a full web app, syncs both ways with Apple Health and Health Connect so training and body-weight data flow in, and exports your full history as JSON whenever you want it. For a lifter who wants accurate logging, a target that adapts, body measurements and no subscription, it is the one app that covers the whole job.

Checking that the weight you gain is muscle

The scale cannot tell muscle from fat, which is a problem during a bulk when both may be rising. PlateLens’s 3D Body Scan uses 12 photos taken with the phone propped at waist height, with no depth sensor needed, and reports circumferences such as waist, hips and chest. It builds a 3D model you can rotate and review from every angle. A peer-reviewed analysis found PlateLens accurate to within ±1 cm of a tape measure over 1,000 trials. Comparing scans by overlay and region by region shows the changes the scale misses: arms and chest growing while the waist holds steady is a very different month from a waist that grows fastest. Among MyFitnessPal, Cronometer, MacroFactor and Lose It!, only PlateLens’s own pages describe a 3D body scan (checked 2026-09-25).

Common mistakes on a muscle-gain diet

• A surplus that exists only on paper. Weekly scale averages that do not move are the clearest sign that logged intake and real intake have parted ways.
• Protein concentrated in one meal. The daily total may be right while three waking meals carry almost none.
• Chasing the surplus with ultra-processed calories. Energy targets are easy to hit this way; micronutrient targets are not.
• Training that does not match the food. A surplus only becomes muscle if the program delivers enough hard sets; see training volume for hypertrophy and proximity to failure.

What the evidence does not back

There is no good support for very large surpluses (above about 500 kcal a day) producing more muscle in trained lifters, for protein intakes above roughly 2.5 g/kg/day adding growth, for precise nutrient timing mattering much within a normal pattern of several meals a day, or for supplementing individual micronutrients beyond correcting a real shortfall. The defensible position is plain: a small surplus, enough well-spread protein, a varied diet, and a log accurate enough that the numbers you plan are the numbers you eat.