Low Body Fat in Women, Stubborn Low Back Fat, and Skinny Fat Training

I haven’t done a Q&A in a while and the mailbag is getting a bit full. So in lieu of boring everyone with another 20-part series on some minutial detail of training, here’s a bunch of questions.

Is Fat the Preferred Fuel Source in the Body – Q&A

So let’s turn to human physiology and talk about what fuel the body ‘prefers’ to use, with the above definition in mind. Now, for the most part, most tissues in the body can generate energy (ATP for the biochemically literal minded) from either glucose or fatty acids. There are exceptions, mind you; the brain uses almost exclusively glucose but shifts to ketones under certain conditions. What it can’t use is fatty acids directly. There are couple of other weird ones, a handful of tissues in the body that only use glucose: the retina is one, part of the kidney, there’s a third I’m forgetting. There’s one other exception to this that I’ll come back to at the end.

Ammonia Smell During Exercise on Ketogenic Diet – Q&A

This is a fairly common report on very low-carbohydrate/ketogenic diet (defined, once again, as any diet containing less than 100 grams of carbohydrate per day), a report of a fairly strong ammonia smell in the sweat during exercise. As I discuss in detail in my first book The Ketogenic Diet this ammonia is produced due to the ultimate breakdown of ATP to ADP to AMP and ammonia.

Rapid Fat Loss Without Weight Training – Q&A

An additional factor, also discussed in the book is that there is often an increase in lean body mass (and this represents both muscle mass and connective tissue) when people gain body fat. From the standpoint of obtaining a ‘normal’ body weight (whatever ‘normal’ means here) losing that ‘extra’ LBM is thought to be beneficial or necessary by some obesity experts.

What Defines Cardio in Terms of Too Much – Q&A

I think you’re referring to the article I wrote on Why Big Caloric Deficits and and Lots of Activity Can Hurt Fat Loss, although I may have addressed the issue in a Q&A as well (I can’t find it). In any case, your question is one that comes up fairly frequently, especially in the context of the Rapid Fat Loss Handbook approach (where I am adamant that excessive activity/cardio can cause the diet to work far less well than expected). People want to know what and how much of certain types of activities will or won’t cause problems.

Weighing for Body Recomposition – Q&A

Basically, his method was to weigh himself everyday. If he was under his target weight, he’d eat two meals. If over, he’d just skip his last meal. He takes a protein shake w/ 100g whey and makes sure he hits at least 1g/lb of lbm everyday. Will this work for recomposition.

Permanent Metabolic Damage Followup – Q&A

About 10 days ago I posted a Q&A titled Permanent Metabolic Damage dealing with the claim that, following extreme contest diets, bodybuilders and other physique competitors have ‘damaged’ their metabolic rate so irrevocably that they are able to gain significant amounts of fat consuming only 700-900 calories per day. I’ll let you read that piece to see my answer. But in the comments sections were several questions that seemed worth addressing although they weren’t all exactly related to the specific topic I was addressing.

Permanent Metabolic Damage – Q&A

Lately I’ve seen a lot of hype regarding metabolic damage that can occur when dieting to very low body fat levels, where individuals permanently “damage” their metabolisms to the point where they are getting fat on 800-900 calories a day. It’s said to occur when losing weight too fast or trying to do too much cardio on top of a very low caloric intake.

Lean Body Mass Maintenance and Metabolic Rate Slowdown – Q&A

I suspect that some of this comes down to an issue of semantics (you sort of get to part of what I’m going to talk about in your second paragraph) but some of it doesn’t. The short answer to your question is that your assumption isn’t entirely correct; even with 100% maintenance of lean body mass (LBM) there can still be some metabolic slowdown. Now here’s the longer answer.

Do I Need to Eat More Fat to Burn Fat – Q&A

I suspect that the idea that one needed to eat fat to burn fat came out of a misunderstanding of some of the early literature on low-carbohydrate/high-fat/ketogenic diets (note: I’m defining a ketogenic diet here as any diet that contains less than 100 grams of dietary carbohydrate; a topic discussed in more detail in my first book The Ketogenic Diet).

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