A few years ago, I had to stop having a dinner-sized dinner. I was commuting a long distance and bed time was too close to when I finally managed to cook it and eat it. My sleep was a mess.
Come to think of it… I wonder if that's why I've been having trouble on fast days lately. The meal isn't large, but it might be enough to bring back my old problem.
Anyway, I came here for a different reason. I've been keeping an eye on Krista Varady's Facebook page, and found this very interesting:
"Do our bodies really have a set point weight?"
The "set point theory" suggests that the body strives to maintain a specific preset weight, and as such, when you lose weight, your body will try to gain it back. Although this theory is fairly well known, there is no convincing evidence to show that a "weight set point" actually exists.
The main reason that people gain back the weight they have lost is because their metabolism has decreased. When a person loses weight, 75% of the weight lost is fat, and 25% of the weight lost is muscle. Muscle mass is a key determinant of metabolism, and as you lose muscle, your metabolism decreases (generally by 200-400 calories/day). It is very difficult for people to adjust to the drop in metabolism, and therefore, they tend to gain the weight back.
The only way to prevent this drop in metabolic rate is to exercise 5 times per week for 45 min/session (which increases your muscle mass). Increasing muscle mass will ensure your metabolism stays high, which can help keep the weight off long-term.