Hi, you can google for this pretty easily. Regular consumption of carbohydrates cause spikes in blood sugar that cause the release of insulin. Insulin is required for your cells to uptake the carbohydrates and restore your blood sugar level. Insulin also promotes the conversion of sugar into fat and the storage of fat. This is basically the principle behind the keto diet, that you eliminate carbohydrates to avoid the fat storing effects of insulin. But this theory is disputed. You can still lose weight while consuming carbohydrates - maybe its not as fast though. If you just keep a calorie deficit, you will lose weight. You also need to keep a calorie deficit on the keto diet to lose weight.

If you're talking about Whisper's post, here you go.

It was something like we've been lied to our whole life

It's true and now well known. Sugar industry lied, bribed and manipulated all our dietary requirements (they still continue to do this). Fat was (wrongly) vilified as the cause of being fat and unhealthy.

Result: widespread weight gain and diabetes.

Same promoter guy went on to do the same thing to promote smoking after it was known to cause premature death.

Whisper's post is spot on, but fails to give solid tips on what to do instead.

I'm still working on this, but it seems to be:

• Lift, duh. Helps with everything.
• Cardio, 30 mins a day, with some HIIT (not every day)
• Long fasting. Start eating late, stop finishing early. Eating window less than 8 hours. (takes time but your body gets used to it but actually fine)
• Minimize carbs, ideally Low GI where unavoidable. Avoid glucose and sugar as much as possible. Avoid fructose like the plague.
• Eat lots of protein and fat, ideally in unprocessed foods (low GI, filling)
• Eat lots of veges, some fruit. (high fibre, low GI, slow absorption, filling)
• You still need to calorie restrict if you want to lose weight, at least I do.

"Avoid processed" is because processed food tends to be ground up and rebuilt (tiny particles means rapid absorption and hence glucose and then insulin spikes). Often high salt and carbs because "processed" means "designed to be tasty despite being cheap".