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To emphasize: the real point is the meta-framework of experiments. Formulate a hypothesis, design a 30-day experiment, test it. I’ve probably done dozens of these over the years.
Here are some examples from the last few years:
30 days of cold showers
90 days of no online news (I thought stress might contribute)
90 days of the carnivore diet
30 days of eating only at In’n’out burger
Doing Starting Strength, a beginner’s powerlifting program
Doing Simple & Sinister, a kettlebell training program
30 days of a low-fiber diet
30 days of a low-protein diet
30 days of a potato diet
30 days of drinking only distilled water (including for coffee)
Eating only pemmican, a raw meat paste invented by Native Americans
But I had that "willpower" for decades and didn't lose much weight. Certainly "pushing harder" didn't change anything.
And then flicking one little switch made it super easy with no willpower involved. So I just don't see how the willpower is related to losing fat.
Do have to add - it's impressive that you went through all these documented efforts. In the name of science and all that.
2) I didn't lose the weight on keto. I did keto for 7 years and managed to gain 100lbs back while on keto. This fat loss is very recent, and while it's still a ketogenic diet, it really is some magic little switch that I've flicked - I just don't know (yet) which one :)
It's far easier for me to just do caloric restriction. Granted I wouldn't lose weight as quickly.