Layne Norton (nutrition scientist, powerlifter) and Mike Israetel (sport physiologist (phd)) side by side: how they train, eat, supplement and sleep, how strong the evidence is, and how to build a plan from either or both.
Training splits are our estimates from each expert’s published routine. Following checked October 2026.
The key differences
Their training weeks are similar: no part of the split differs by more than 5 percentage points.
In plans in their style, both use 1-minute intervals for hard sessions.
We rate the evidence behind Norton's protocol higher: strong, against solid for Israetel.
Supplements that go into a plan: Norton, creatine monohydrate, whey protein, caffeine before training; Israetel, none (food first). Prescription items and personal stacks stay out of every plan.
Neither has a separate mobility routine; plans add 10 minutes a day of basics.
Protocols side by side
Each line is rated for the evidence behind it. “Doctor only” items never go into a plan.
Training
Layne Norton
Lift weights consistently, year after year, and take sets close to failureSome evidence
Exercise improves health markers even when it does not change your weightStrong evidence
Track daily steps while dieting: everyday movement tends to drop as calories fallSome evidence
His PHAT programme: 5 days a week, two heavy 'power' days plus three higher-rep hypertrophy daysPersonal habit
Mike Israetel
For the average person, about 30 minutes of training twice a week gives the best return on time.Some evidence
After 40: most sets in the 10–20 rep range, some at 20–30, and 5–10 reps only rarely, because heavy low-rep sets raise the risk of injury.Some evidence
Train each muscle twice a week, starting with 1–2 hard sets per muscle per session, and add a set the next week if you recovered well.Some evidence
Lower the weight slowly and pause for 1–2 seconds at the bottom.Some evidence
Warm up more: three warm-up sets (light, medium, heavier) before the first working set, and 1–2 before each later exercise.Personal habit
Add weight in small steps: rarely more than about 2.5 kg or one rep per set at a time.Personal habit
Choose joint-friendly exercises with a high stimulus, for example a hack squat instead of a heavy back squat.Some evidence
Take a planned easy week every 4–6 weeks, and a lower-volume month about every 5 months.Personal habit
Eating
Layne Norton
Track calories and protein; food labels can be ~20% off, but consistent tracking still shows your true intake over timeSome evidence
Weigh yourself each morning and compare weekly averages, not single daysSome evidence
Protein about 1.6 g/kg a day; up to ~2.2 g/kg when dieting or very leanStrong evidence
Choose a diet style you can sustain; low-carb and low-fat work equally well with calories and protein matchedStrong evidence
Fibre about 15 g per 1,000 kcalSome evidence
Seed oils are fine: replacing saturated fat with polyunsaturated fat lowers LDL and heart riskSome evidence
Mike Israetel
If you want to gain muscle, only gain weight when you are lean: about 0.25 kg a week for 4–8 weeks, then a fat-loss phase.Personal habit
Stay under about 20% body fat while gaining, come back to about 15% afterwards, and get blood tests after gaining phases.Personal habit
Supplements
Layne Norton
Tier 1 – creatine monohydrate 3–5 g a day; loading is optional; timing does not matterStrong evidence
Tier 1 – whey protein 20–40 g per serving (about 2–3 g leucine) to help reach daily proteinStrong evidence
Tier 1 – caffeine 3–6 mg/kg about 45–60 min before training; lower doses still help alertnessStrong evidence
Mike Israetel
No specific guidance in what we reviewed.
Sleep & recovery
Layne Norton
Avoid caffeine late in the day; it can harm sleep even if you fall asleep normallyStrong evidence
Carb timing matters little on average; if carb-heavy meals make you sleepy, move themNote
Poor sleep and unmanaged stress are bigger problems than small nutrition detailsNote
Mike Israetel
No specific guidance in what we reviewed.
Weak spots to know
Layne Norton
Commercial ties: he co-founded Outwork Nutrition, which sells whey protein and products containing creatine — overlapping with his Tier 1 list — and co-founded the paid Carbon Diet Coach app and the BioLayne coaching business. He has also disclosed past research funding from the National Dairy Council, the National Cattlemen's Beef Association and the Egg Board.
Reverse dieting, which he helped develop and popularise, had no published controlled trials supporting it as of 2021; its use rests mainly on coaching experience.
His relaxed view of seed oils is contested by others in the health space. On The Drive (2026), Peter Attia presented the strongest case against seed oils for a debate after the booked guest declined, while saying his own view is close to Norton's; debate continues over older trials and LDL oxidation.
Mike Israetel
Most of his content is aimed at bodybuilders and younger lifters; advice for people over 40 is a smaller part of it.
Many specific numbers, such as when to take easy weeks or how fast to add sets, are coaching rules of thumb rather than findings from trials.
He sells training programmes and diet products through RP, the company he co-founded.
Build a plan from Norton, Israetel or both
Your free plan shows a week of gym sessions, cardio, a day of eating, supplements and mobility, fitted to your age, time and health.
What is the main difference between Layne Norton and Mike Israetel?
Their training split differs most in intervals: Norton about 10%, Israetel about 5% (our estimate from their published routines). Norton's signature habit is Tiered supplements; Israetel's is 2 × 30 min, close to failure.
How much protein do Norton and Israetel recommend?
Norton: 1.6–2.2 g/kg. Israetel: No fixed target.
Whose advice has stronger evidence?
We rate the evidence behind Norton's protocol higher: strong, against solid for Israetel.
Do Norton and Israetel disagree?
Not directly in what we reviewed. Their differences are in emphasis: their training weeks are similar: no part of the split differs by more than 5 percentage points.
Can I combine Norton and Israetel?
Yes. In Build my mix you choose one expert per area, for example one for strength and another for eating. Your free plan shows the result straight away.