[Preview] What happens if you overeat on a low-carb diet?

I wanted to give you guys
a bit more of a background on me. Some of you might know
my self-experiments, my overeating tough experiments
where I ate 5000 cal a day. And I did that
with three different diets. And basically the idea was, was that I’d eat
double the amount I usually would, and see what happens
with those three different diets over 21 days, with a three-month washout period
in between. The first one was Low-carb Real Food and I ended up in a 47,000 cal surplus, which according to the calorie formula
should’ve equaled 6.1 kg. But in reality, I actually only put on
just over a kilogram, which is 2.2 pounds, and actually lost 3 cm from my waist,
which is just over an inch. And then, experiment two,
after that three-month washout period, low-fat fake food… you can see that. Again, I ended up
in a 47,000 cal surplus, this is after exercise, protein,
fiber, everything like that. Again should’ve been
6.1 kg of weight gain. I ended up being 7.1 kg,
which is approximately 16 pounds. And then, I put on 9.25 cm on my waist,
which is just shy of 4 inches. And for a guy that’s always been
naturally lean, yeah, that was interesting. And then experiment 3
was very low-fat vegan. So, I ended up
in just shy of 40,000 cal net surplus. And is quite interesting,
following on from that last talk, I was actually eating
about 150 g of fiber a day, so, I was regular. So, I should’ve gained 5.2 kg, ended up putting on 4.7 kg,
still an substantial amount, and putting on 7.75 cm on my waist,
which is approximately 3 inches. So, this kind of really set me up in terms of giving me the credentials to get in touch
with all of these doctors…


  1. I applaud Sam Feltham doing this self-experimentation. It really illustrates, on an anecdotal level, the efficacy of low carb. It demonstrates that, while calories matter, they don't matter as much on a low carb diet, thus giving the practitioner a little more leeway when it comes to quantity of consumption. This has been my experience as well. Of course, anecdotes, in and of themselves, don't lend scientific credibility to such a conclusion. That is why I wish someone would fund a study, doing the exact same isocaloric comparison between low fat/high carb and low carb/high fat diets, with people confined to a metabolic ward for an extended period of time.

  2. I will rather give some of my insulin resistance and hyperinsulinemia to Sam to see will he gain weight even on Low-carb diet. … somehow I'm sure with 5000 Cal he will.

  3. hey, sam!

  4. Love this

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