How to sustainably lose fat while maintaining muscle | Peter Attia and Derek MPMD

Bodybuilders maintain 1 gram of protein per pound of body weight throughout their competition diet until approximately one week before stepping on stage, even while in a severe caloric deficit, because this preserves training volume and prevents muscle loss.

“you see them at least hitting 1 G per pound body weight in protein like without fail and they will hold that until the stage unless there is some like maybe on the week of they're already at their target body fat and then at that point they're trying to do tactics to make their stomach as you know not full of anything as possible”

A foundational step for sustainable weight loss is establishing your maintenance caloric intake by tracking food precisely for one week, then using that number to create a modest deficit; online calculators can ballpark this to within ±300 calories, but personalized tracking is more accurate than calculator estimates.

“from there you want to be whatever your maintenance calories is which is you know it might take a little bit of finagling to figure out what this is when you've never done it before but there are calculators online that roughly ballpark give you what will be plus minus 300 calories or something of what it takes to stably hold your body weight for um like if you ate that diet it wouldn't go up or down what I do typically is I take that number and I say use your exact diet for a week with this calorie amount like this is your diet model and this is your totally calorie goal for the day eat exactly this every day and then see what the average is at the end of the week”

Daily weight fluctuations are unreliable indicators of actual fat loss because they vary based on water retention, food volume, and bowel movements; tracking the average weight change over a full week is far more accurate than daily weigh-ins.

“cuz just going by daily fluctuations could be wildly different you might jump up or down based on water based on food volume based on if you took a dump or Not”

To establish a personalized maintenance baseline, eat your target calorie amount every day for one week, then assess whether your weight went up or down; if weight increased, you're eating slightly too much; if it decreased, you're in a deficit; adjust accordingly to find true maintenance before subtracting 300 calories for deficit.

“so you have a Target calorie amount and you eat that every day for a week and you see if your weight goes up or down and if it goes up you know you're eating a bit too much if it goes down you know you're in a deficit and you decide from there is the weight loss too fast if you lost three pounds in a week perhaps it's too fast and you want to kind of like tight trate it back up a little bit”

Creatine monohydrate increases intramuscular water retention (volumization), which enhances cosmetic muscle appearance and supports training performance, and elite bodybuilders maintain creatine supplementation even to the stage of competition rather than cycling off as was previously believed.

“when did bodybuilders come off creatine they don't they'll take creatine to the stage yeah they used to think you should come off because it's bloating but and I'm sure Lane would tell you the same but most of the water weight is in the muscle yeah like it it is helpful for cosmetic appearance and for sustaining training uh performance”

The most performance-enhancing macronutrient during dieting is carbohydrates, as they directly fuel training intensity, maintain muscle glycogen, volumize muscle, and drive gym performance outcomes—more so than protein or fat.

“carbs is like the most performance-enhancing macro in terms of actually driving your performance outcomes in the gym volumizing the muscle having glycogen topped out it's Etc”

Aggressive caloric cuts (e.g., dropping from 2,800 to 1,800 calories abruptly) produce rapid initial weight loss but trigger metabolic adaptation and plateaus faster, creating a 'hole' from which recovery is difficult; sustainable dieting requires resisting the temptation of aggressive cuts in favor of gradual titration.

“the people who aggressively cut way too fast will end up losing more weight off the bat but they will end up in a state of adaption faster whereby you are basically going to not only EXP spend less calories at rest via the depression of like non-exercise activity thermogenesis which is like fidgets and moving with just like your everyday activities you will actually start to subconsciously do that Less”

The body's non-exercise activity thermogenesis (NEAT)—energy expended through fidgeting, moving, and everyday activities—is suppressed when caloric deficits are too aggressive, and people subconsciously reduce this activity further, creating a vicious cycle of reduced energy expenditure.

“spend less calories at rest via the depression of like non-exercise activity thermogenesis which is like fidgets and moving with just like your everyday activities you will actually start to subconsciously do that Less”

Natural (non-drug-using) athletes are highly susceptible to hormone suppression from aggressive caloric restriction and large concurrent cardio volume; therefore, they should avoid both extreme deficits and excessive energy expenditure to preserve testosterone and other anabolic hormones.

“because as a natural you are very susceptible to Major aberration and hormone suppression if you are going to deprive the hell out of nutrients and especially if you're doing huge amounts of cardio concurrently because you think that's what you need to be doing also don't put yourself in a hole on the energy expenditure side”

Post-meal movement (walking) does not burn all the calories consumed in that meal, but it meaningfully improves fuel partitioning and blood glucose stability, leading to better body composition outcomes than remaining sedentary despite the caloric intake.

“the mobilization doesn't require that you you know you're clearly not going to oxidize everything you ate like if they just ate 800 calories they're not going to burn 800 calories on a walk of any duration but just getting out there and walking you're saying leads to better fuel partitioning seemingly yeah”

A starting caloric deficit of 300 calories below maintenance is conservative and sustainable, allowing the dieter to 'milk' that deficit for all possible fat loss before adding cardio or further reducing calories, thereby preserving training volume longer.

“I typically recommend trying to milk what you can out of that little tiny calorie increment before I decide okay do I need to then add some more cardio to my regimen or do I want to decrease food by another 100 calories or do I want to add you know metabolic enhancing pharmacology you can actually make the call at that point because you've exhausted the actual increment”

Professional IFBB bodybuilders consuming exorbitant food while on insulin, HGH, and large anabolic doses prioritize post-meal walking to optimize nutrient partitioning and manage blood glucose, demonstrating that even with pharmaceutical support, activity-based nutrient management is prioritized.

“what we see even in like the ifbb with these TP bodybuilders who are trying to not get fat as they eat exorbitant amounts of food and they're on insulin and HGH and huge amounts of anabolics they are doing things like going for walks after they eat their meal which is more potent than metformin at controlling blood glucose like they're actually making sure they are moving around and actually shuttling nutrients as much as they can even outside of the gym”

Pushing into aggressive deficits prematurely creates nutrient deprivation unnecessarily, shortening the time available to achieve fat loss; instead, dieting should proceed by exhausting each calorie level (waiting for weight loss to plateau at neutral for at least a few days, typically a week) before adding cardio or cutting further.

“rather than trying to lose you know 6 lb and two 2 weeks why don't I go with you know like 1 to two lbs at most and actually milk what I can out of that little tiny calorie increment before I decide okay do I need then add some more cardio to my regimen or do I want to decrease food by another 100 calories”

Because bodybuilders on severe diets cannot consume adequate protein through high-calorie sources like steaks (due to fat content), they rely instead on lean protein sources: chicken breast and protein powders, which allow them to hit 1g/lb protein while staying within caloric targets.

“so what they do on the last week doesn't really count up up until a week out up until a week out they would still be taking one gram of protein per pound of body weight typically and to your point at this point you can't be doing that with steaks cuz there's way too caloric so you are on the chicken breast protein powders”

The 40/40/20 macronutrient split represents a relatively low-fat diet; in practice, this means eliminating visible fats like olive oil on salads (which can add 200–300 calories to a salad), as fat is the most calorie-dense macronutrient at 9 calories per gram.

“when you are eating meat you will achieve the majority of that through the fat content of your meats and it will depend how lean of the cuts you are getting... they're just cutting that out yeah like olive oil and a salad is uh one of the first things I would be looking at as you probably just added what 200 to 300 calories to a big salad for sure if not more”

Accurate nutrition tracking requires reading every nutritional label and counting all intake—including sauces, drinks, and condiments—as omission of small caloric items can compound into significant deficit errors; eventually, experienced trackers internalize macros so well they can estimate portions visually without constant app use.

“making sure you're getting your you know you have some sort of number you're going to adhere to and you know how to measure every day which basically is just reading every nutritional label you have and becoming intimately aware of what you're ingesting if you put something in your mouth you count it regardless if it's a sauce regardless if it's a drink regardless of it's a lick like you you count that”

Creatine may inhibit myostatin (a negative regulator of muscle growth), has neurological benefits, may affect fertility, and is used clinically in women at doses of 10+ grams to treat depression, making it one of the most broadly beneficial natural compounds beyond its well-known muscle and performance effects.

“it's one of the only natural compounds that may inhibit myostat in to so it has that upside um and it's like all the things it does from a neurological standpoint perhaps fertility it's even used for depression now in women at like 10 plus grams or something which is crazy so a lot of use cases are coming out”

Walking after meals is more potent than metformin at controlling post-meal blood glucose elevation, and elite bodybuilders (even those on insulin, HGH, and anabolic steroids) use post-meal walking to improve nutrient partitioning and manage the large caloric intakes they're consuming.

“they are doing things like going for walks after they eat their meal which is more potent than metformin at controlling blood glucose like they're actually making sure they are moving around and actually shuttling nutrients as much as they can even outside of the gym”

An abrupt drop from maintenance (e.g., 2,800 to 1,800 calories) initially feels like success due to rapid weight loss, but quickly leads to unsustainable hunger and a sense of deprivation, stalling progress and leaving no further tools available (cardio, further cuts) because the deficit was too aggressive from the start.

“if you push too hard and you go from let's just say you're eating 2,800 calories a day and you instantly drop to 1,800 you will lose a ton of weight off the rip and it you'll think oh this is great and then very soon you will get to a point where it's like holy hell I am starving this is not sustainable what am I doing what do I do next I plateaued now where do I go from here it becomes easy to dig yourself into a hole if you're not careful about this like titration down essentially”

Bodybuilders typically begin their competition diet 10–12 weeks before stepping on stage, starting from approximately 10–12% body fat (not from their peak body fat percentage), then proceed through a staggered process of titration rather than sudden aggressive cuts.

“if you were to try and take away from a bodybuilder how would I apply this when they're stepping on stage at literally dice to the socks 5% body fat it's not that you're getting there it's that you're stopping at like the eight we out from competition Mark of a bodybuilder maybe not eight maybe like 10 or 12 but the process they took to get even there was very staggered calculated”

A recommended macronutrient split for weight loss is 40% protein, 40% carbs, and 20% fat; this ratio maintains hormone production, provides adequate carbohydrate for training performance, and ensures sufficient protein for muscle retention.

“a good split a lot of people follow is 40% protein 40% carbs 20% fat and this is kind of like a ratio that allows you to sustain uh hormone production and have some amount of fat that supports it um carbs for some level of gym performance and then protein for hopefully hitting your goals”

The general rule of thumb for sustainable weight loss is no more than 1% of body weight per week, though 1 pound per week may be a more reasonable target for most people, as this rate allows for continued recovery and training performance.

“the staggered approach you want to take is that you don't really want to lose more than I think typically it's like 1% of your body weight per week is a general rule of thumb which is I guess could be depending how obese you are could be a little bit aggressive but even let's just say a pound a week maybe is like maybe a more reasonable Target”

A natural competitive bodybuilder sub-200 lbs in condition may be consuming below 2,000 calories daily, while an IFBB professional at 260 lbs might be at 2,500–2,600 calories; the lower number seems like a lot to the general public, but it represents a significant deficit given their size and continued training intensity.

“if they're stage ready and they're natural and like sub 200 lb like they might be down to you know below 2,000 calories potentially if they're a top ifbb professional Mr Olympia a competitor who weighs 260 you know they could be at 2500 2600 it kind of depends on the person”

Bodybuilders are more mindful of preserving tissue and do not create huge caloric deficits at any single point in time; they arrive at extreme leanness (5% body fat) through staggered, calculated approaches that protect muscle mass rather than starving themselves.

“the way they arrive there no one is is more mindful of preserving tissue than bodybuilders so in other words they're not they're not creating huge deficits at any one point in time”