Diet, Supplements & Recovery: Andy Galpin's Performance Playbook
Muscle physiologist Andy Galpin walks through how he fuels elite athletes and everyday exercisers — and shows the two diets are nearly identical. The big levers turn out to be unglamorous: total calories, protein, carbohydrate placement around hard sessions, filling nutrient gaps, movement-based recovery and sleep.
Overview
Andy Galpin, director of the human performance center at Parker University, joins Rhonda Patrick for a long-form conversation on nutrition, supplementation and recovery. He opens by arguing that a performance diet and a longevity diet overlap almost completely — protein-centred, varied, colourful, fibre-aware, calorie-managed — with the main divergence being caloric balance. He then unpacks his lab's newly published time-restricted eating study, in which well-trained lifters in a caloric surplus gained muscle on a 16:8 window but drifted toward higher fatigue and lower training volume over eight weeks.
Carbohydrate timing emerges as the one nutrient where placement genuinely matters, especially for people training twice a day or repeating hard sessions. Galpin reframes metabolic flexibility as the ability to run the whole fuel spectrum rather than maximise fat burning, and describes supplements as a way to remove 'performance anchors' before chasing enhancement.
He covers magnesium, omega-3, iron, caffeine, rhodiola, beetroot, beta-alanine, creatine, sodium bicarbonate, glutamine and collagen with a consistent food-first bias. On recovery, low-level blood flow, warm water immersion and thoughtful timing of cold exposure do more than any supplement. The final third turns to readiness markers — respiratory rate, heart rate variability, resting heart rate — and to sleep, where routine, room ventilation and CO2 levels get more attention than any tracker score.
Key quotes
5At the highest level for the average person, if you're eating like a high performance athlete, for the most part you're also eating for longevity.
Metabolic flexibility is not just maximize fat burning. Those are not the same thing.
You don't have to have protein powder ever.
There is nothing we can do to enhance performance more than sleep. There's no supplement, there's nothing that's even close.
CO2 levels rise above 900 parts per million and this will significantly and dramatically affect everything from sleep onset, sleep quality, next day perceived fatigue, next day arithmetic ability.
Key ideas
9Performance and longevity diets overlap almost entirely
Galpin says if you laid an Olympian's diet next to a health-focused non-athlete's, you couldn't tell them apart. Both are protein-centred, varied in colour, fibre-aware and calorie-managed; the main difference is caloric balance.
Fasted training is a preference question before it's a physiology question
The mitochondrial benefit of fasted low-intensity work is real but small. Galpin's first filter is how the person performs and feels, not the theoretical adaptation — and he rarely prescribes fasted cardio to someone who isn't already doing it.
16:8 didn't block muscle growth, but fatigue crept in
In his eight-week study, well-trained lifters in a caloric surplus gained muscle on time-restricted eating despite training fasted and delaying food. Over time, however, perceived fatigue and naps rose and training volume fell in the restricted group.
Carbohydrates are the nutrient where timing genuinely matters
Unlike protein, carbohydrate placement changes outcomes — before long or intense sessions and quickly afterwards when the next hard effort is close. For someone training a body part every other day, it is mostly personal preference.
Metabolic flexibility means range, not maximal fat burning
Galpin argues the term has been redefined into 'burn as much fat as possible', which is just specialisation on the other side of the equation. He frames it as an everyday human capacity: going hours without food and still thinking and moving well.
Remove the anchors before chasing enhancers
The biggest gains he sees come from closing nutritional gaps — magnesium, omega-3, vitamin D, iron where relevant — rather than from ergogenic compounds. Only once physiology is unencumbered does he look at creatine, beta-alanine or stimulants.
Supplemental antioxidants can attenuate adaptation — food ones don't
Berries and colourful whole foods have never been shown to blunt training adaptation. High-dose supplemental vitamin C and E can shave some of it off, which is why he separates 'adaptation phases' from 'peaking phases' where he happily goes higher.
Recovery is mostly low-level blood flow for a long time
Walking, warm baths, sauna, compression boots and stimulation devices all converge on the same mechanism. Galpin also highlights the orthostatic pressure of water itself, independent of temperature, as an underrated recovery tool.
Respiratory rate flags problems before resting heart rate does
Resting heart rate is a late, insensitive signal — by the time it moves, the problem is weeks old. A one-breath-per-minute rise overnight is far more predictive of accumulating stress or an incoming illness.
Practical takeaways
7- 1
Fuel a morning session with something small and simple 22:00
Roughly 300 calories — a banana with a shake, or yogurt with granola and berries — covers most people who train early. Small servings, easy to digest, out the door.
- 2
Rehearse race-day fuelling in training 58:00
Practise your pre-, during- and post-session nutrition exactly as you plan to use it on the day, so nothing about the event is new to your gut.
- 3
Treat magnesium as a likely gap, not a lab number 1:56:00
Standard blood magnesium reflects little of body status. Galpin adds magnesium for roughly nine in ten people he works with, alongside magnesium-rich foods, and notes the form matters less than the dose being sensible.
- 4
Beta-alanine needs weeks, sodium bicarbonate works acutely 2:40:00
Beta-alanine builds intracellular carnosine over three to five weeks and can be split across the day to avoid tingling. Bicarbonate is a same-session tool and is often used as a topical cream to skip the gut.
- 5
Keep cold water away from the hours right after lifting 3:20:00
Cold immersion is effective for soreness but sits badly next to a muscle-building session. Galpin separates the two and reserves cold mostly for stress resilience and breathing work rather than adaptation.
- 6
Build a wind-down routine, however mundane 3:38:00
Consistency beats ceremony — dishes, teeth, then something deliberately unproductive. The point is giving your brain permission to stop, not 45 minutes of breathwork.
- 7
Ventilate the bedroom before you sleep in it 3:44:00
Open doors and windows earlier in the evening, or run a fan, to bring CO2 down. Nasal congestion at night responds to air filtration and simple nasal dilators.
Topics & chapters
15Performance versus longevity nutrition
Why the two diets are nearly indistinguishable and where the small differences actually sit.
Training fasted
What the mitochondrial data really shows, and why preference and context outrank it.
The 16:8 time-restricted eating study
Eight weeks, well-trained lifters, caloric surplus — muscle gained, but fatigue accumulating.
Carbohydrate timing around training
Pre-, intra- and post-session carbohydrate, and when the numbers stop being realistic.
Dietary fat: how much, what quality
Why fat is the third consideration, what chronically low intake costs, and the whole-food default.
Metabolic flexibility, reclaimed
Range versus specialisation, and why aerobic and anaerobic aren't separate systems.
Protein timing, powders and the whole-egg study
Pre-sleep protein, why total daily intake dominates, and what the yolk may be contributing.
Micronutrients: magnesium, omega-3, iron
Where the common gaps are, why blood magnesium misleads, and why iron deserves caution.
Caffeine, rhodiola and beetroot
Dose ranges, desensitisation myths, an adaptogen you wouldn't feel, and a non-stimulant lift.
Beta-alanine, creatine, sodium bicarbonate
Buffering fatigue, dosing by body size, and the cream that bypasses your gut.
Antioxidants, vitamin C and blunted adaptation
Food versus supplements, and the optimisation-versus-peaking framework.
Glutamine, collagen and recovery supplements
Gut and immune angles, tendon research that changed his mind, and why tart cherry rarely makes the list.
Recovery in practice: movement, heat, water, cold
Fascia versus muscle soreness, compression, sauna and hot water, and where cold belongs.
Readiness markers and overreaching
Respiratory rate, HRV and resting heart rate — plus what functional overreaching really means.
Sleep: routine, ventilation and CO2
Three high-impact changes, the wind-down index, and the bedroom air nobody measures.