ketone

Just to mention a test I did, sweeteners decreases your ketone levels. Your body is expecting sugar.

I was running on ketone or whatever the terminology is. I was swimming everyday for two hours with no problems what so ever.

Finally having fooled around with both diets a low carb ketone mode diet is super sensitive to what you eat; highly disciplined. Eat one apple and you've ruined days of work getting into ketone mode.

Your liver will create glucose when needed and your brain will happily burn ketone bodies when it isn't available. You can easily survive on a diet of mostly animal fat.

Ketosis is a state where you eat so little carbohydrate, that your body is forced to create "ketone bodies" to fuel the brain. This typically happens at <50g/day carbohydrate.

You can know for sure by buying ketone test strips and drinking enough water. I've tested out ketosis for myself and experienced some strange effects: salad tasted better, but I had no cravings and no hunger; some days all I had was an egg.

Also, many people in ketosis have very low blood sugar as their body is mostly running on ketone bodies like β-hydroxybutyrate in lieu of sugar.

There was a study back in 2009 suggesting higher ketone levels in sweat act as a natural mosquito repellant, but that state could be changing microbiome balance/chemistry, too – so there are multiple possible mechanisms.

Out of hundreds executed, There are a handful of interesting ones, benzoylphenylalanine, azidophenylalanine, phenylalanine methyl ketone, and bipyalanine, but the thing is, that nature really has a good selection of amino acids to accomplish just about anything it could do. The reliable chemistries that are compatible with a water solvent are few, which is why so much organic chemistry is done in nonaqueous solvent.

If you fast your body starts metabolising fat, releasing ketones. Normal cells can use ketones for energy, but cancer cells cannot. Hence, fasting could be a way to manage cancer. So at least one of the people mentioned in the post might not be a crackpot. Here's a bit of academic work on the subject: "The goal of the current study was to test the hypothesis that ketone bodies can inhibit cell growth in aggressive cancers ...