Cannot count the doctor who assured my overweight self that ‘calories in and calories out’ was a rule of science and if I wasn’t losing weight it was because I was eating too much and not exercising enough.
Everyone processes different items differently and cannot be cookie cutter to everyone.
Not true at all.
Losing weight is very simple - 3500 calories = a lbs of fat.
A daily deficit of 500 calories either through diet or exercise will yield one lbs weight loss per week in almost all people.
The biggest problem is that most people grossly underestimate how much they are eating and overestimate how many calories they are burning through physical activity.
Starvation does not work either since the bodies metabolism will shut down and you will burn muscle and not fat which is a disaster for the body.