Comment Re:Yes brown fat will help you (Score 1) 234
Of course you can eat 3000kal/day, you can also eat 4000 if your metabolism is fully functional it will not store excess fat unless you are stressed
Nonsense. Metabolism is mostly driven by demand (how much you move), and only to a small degree by available calories. Your argument also make no sense from an evolutionary survival perspective. Excess calories should be stored as fat to survive future times where food may be scarce.
that isn't true, it is not that simple. Muscles actually prefer burning fats at rest and storing glucose from (or converted to from) food as glycogen so there is a store for aerobic erxercise but more importantly for the brain since fats can't cross the blood brain barrier. We need the fats to store fat soluble vitamins too. There are many many factors driving metabolism, the basic ones are activity, hormone levels (made more complex in that some like hgh's have insulin effects), food types eaten and fast periods (including hour(s) long not just days/weeks/months), climate, daylight length, genetics etc etc so it gets complicated and no generalisations can be made.
Most people ask nutritionalists and personal trainers who understand very little and some of it they know the right answer but their reasoning is wrong so they form extra conclusions which are crap. What you really need is to be asking biochemists and molecular biologists and the like those questions or medical practitioners strong in those areas.