It is still just calories in and calories out. Some people naturally have a higher metabolism and a higher basal metabolic rate. It still doesn’t change the equation.

Yes, it’s a well known fact that if you eat too few calories, that your metabolism slows down - and you burn less calories. That doesn’t make anything that the original poster said scientifically valid.

I saw all sorts of crazy crap that people believed would help them lose weight and tone when I was a part time fitness instructor like excercises that would help them spot reduce (no such thing) to people who tried to come into my classes wearing those plastic bags because they thought it would help them lose weight. They reported me to management plenty of times for not allowing them to come to my class like that and I would budge.