i am anti low carb too, but for slightly different reasons.

people are fat because their metabolisms have decided to be slow, not because they eat carbs--or fats for that matter.

could a bear stop himself from gaining weight in fall?

have you ever noticed it isn't easy to control weight? it IS ALMOST IMPOSSIBLE and takes constant effort to be a different weight than the weight your body WANTS TO BE. Ask an underweight person!

people are overweight (and underweight) because they are UNWELL.

i have tried low calorie, low fat, ultra-low carb. i've been a vegetarian and also a vegan. I have rejected all these special diets over time. there is a reason that we have been handed the "balanced meal" from our ancestors. traditional meals with carb, fat, protein, veg works best for most people.

yes, there are reasons for some people to be low carb. ultra-low carb can be life-saving for those with type 1 diabetes--it keeps them off the blood sugar roller coaster and helps them live longer, healthier. there are other disease states in which ketosis is useful, don't get me wrong.

but for most people, they need to get HEALTHY to get their bodies to decide to be a healthier weight.

this means solving (amongst others) inflammation problems (chronic infections, say, including teeth), nutrient deficiencies, sleep problems including apnea, toxic liver from a lifetime of drinking and pain relievers and pharmaceuticals, busted gut from antibiotic usage, chronic lack of vitamin D, couch potato syndrome, wrong sex hormones, lack of iodide, gluten intolerance...some may need to take control of their own thyroid meds and get on natural thyroid--basically the whole gamut of natural health.

and that is why loosing/gaining weight is such a complex issue.