>>16839301 (OP)
(1) your metabolism slowed down after you starved yourself. As soon as you stop starving yourself you will gain the weight right back
(2) the body uses fat to store toxins, so now that you depleted your fat stores, your body is slowly poisoning itself, and is craving for you to gain the weight back
The only safe long-term way to losing weight is slow and steady detoxing. The body tightly controls satiety in accordance with how much toxins it is safe to expose you to. Storing toxins in fat cells keeps you safe, but eventually causes heart disease though, so there's no win long-term, only short-term keeping the engine sputtering.
>>16840346
The brain consumes 20% of the bodies energy, then you realize how much is spent with the liver metabolizing food, the kidneys excreting toxins, heart pumping blood ... it's obvious that too much exercise and muscle mass directly cuts into your ability to supply brain power.
>>16840415
yep most engineers are skinny, which shows high metabolism = fast brain metabolism