Nicomorphinist
Bluelighter
What would be the origin of the crisps debate? They are practically medicine for me as, especially in the summer, I am very prone to dehydration and hyponatraemia, so time to any kind of salty food is very helpful.
Aha I just read the wiki article on Olestra. I vaguely remember reading some warning about it on the back of a packet of crisps circa ~1997. Insane that they were initially marketing it as a weight loss drug, and when they put it in chips they had to add additional nutrients because the olestra itself drains fat-soluble nutrients from the body.. probably a huge reason that potato chips get such a bad rap nowadays.. Leaky-Anus Syndrome.. doesn't sound good at all!
So it seems that either these calories counted negatively (joking) or other factors were responsible for your weight loss.
We need to take into account that since you did not eat well probably glucose levels were decreased in your body, meaning that amino acids were converted in glucose diminishing your muscular mass (your weight). In addition, fat acid metabolism was more accentuated in order to compensate the transformation of amino acids in glucose.
Metabolism (gain or lose of weight) will depend on which types of nutrients you are ingesting, but this does not mean that the calories are not fully counted. For imagine: if you consumed 3500 calories, where are they if they are not used or stored? Energy cannot be lost (disappear) only transformed.