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At what frequency do changes in body composition take place (if it's a "frequency" at all), and what does that imply for weekday dieting with weekend cheating?

If over the course of a full week, a person's total calories in are roughly equivalent to their total calories out, is it still possible for that person to have lost weight by the end of that week? (See below for specific case information and caveats.) If for example 5 consecutive days are spent in a ~250-calorie deficit, and then 2 consecutive days are spent in an unknown (but potentially catastrophic) calorie surplus, is it possible that the 5 consecutive "good" days could cumulatively amount to more weight lost than the 2 consecutive "bad" days amount to weight gained? Perhaps something to the effect of daily changes (in pounds) of: -0.2, -0.2, -0.2, -0.2, -0.2, +0.3, and +0.3 for a -0.4 net loss on the week. Do the daily totals count for anything or is it more about the weekly total? (Hence the reference "frequency" in the title of the post. Part of me suspects our bodies are *constantly* churning when it comes to calorie burning, so the concept of a "frequency" might not fit, but then again there *are* other processes that take place in our bodies that are very much periodic and do have "frequencies" of sorts, so I'm wondering if body composition changes might somehow fall into that category.) Hope this makes sense. Any insight would help resolve a good natured debate among friends (see below for the additional backstory). And in case you do end up reading this, I would be remiss if I didn't mention how much I appreciate the positive impact your podcasts have had on my overall health and wellbeing. I do believe we'd all be better off if more people took an interest in content like yours. -- Backstory and longer lead-up to the question: My friend and I are in a spirited debate about how it would be possible for me to lose fat and maintain muscle under the following conditions: 1) Maintaining a *weekday* calorie deficit of approximately 250 calories (trusting published nutritional info for calories in and whoop for calories out) 2) Achieving said deficit while eating 1g of protein per pound of bodyweight, and getting 15g of fiber per 1,000 calories 3) Doing about 3 full-body, compound movement, resistance/hypertrophy training sessions per week (deadlift, front squat, bench press, overhead press, and chin or pull ups -- 3 sets of 6ish reps each exercise) 4) (And finally, the kicker) Staying generally active on weekends but eating and drinking to such excess that the total weekly deficit is likely closer to 0 and maybe not a deficit at all. I was very consistent with this routine between DEXA scans on 11/17/22 and 3/3/23. According to the DEXA measurements I lost 6.4 pounds of fat and gained 2.7 pounds of muscle between those dates. So on average, I lost 0.4 pounds of fat per week. Understanding the caveat that one's changes in body composition are highly situation dependent (eg body composition starting point, strength training experience level, metabolism, etc.), these results sparked the following debate with a friend: Friend: "5 days of a 250-calorie deficit is a 1,250-calorie deficit going into the weekend. We can't say for sure since you weren't tracking calories on weekends, but knowing how much you can eat and drink, 1 (or sometimes 2) pizza- and beer-fueled binges per weekend all but guarantee that your weekly deficit was much closer to 0 or not a deficit at all." (Let's assume he's right about this.) Me: "You're not wrong, but then how do we explain the DEXA results?" Friend: "Your weekday deficit must have actually been far more than 250 for you to have cheated so heavily on weekends and still lost 0.4 pounds of fat per week. Maybe the nutrition labels were inaccurate for measuring calories in, and/or whoop was inaccurate measuring calories out. But your deficit going into the weekend would have needed to be far greater for you to eat and drink like a pig for those two nights and still be in a weekly deficit that would yield 0.4 pounds of fat loss" Me: "Maybe changes in body composition take place on a daily cycle instead of weekly? Is it possible that 5 consecutive days in a 250-calorie deficit represent 5 days in a row of losing 0.2 pounds of fat each, and on the two days of surplus I only gained back 0.3 pounds each?

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