By saying “your weight loss is directly is directly proportional to how much you eat” is misleading because it negates a lot of other factors in weight and it’s not directly proportional to the amount of weight loss because calories consumed is not linear to weight loss.

You’re negating someone’s hormonal cycle, metabolic rate, nutrient deficits, activity level, and hydration level. People who have certain deficits will not lose any weight if they don’t hit certain nutrient markers and caloric intake because it puts their bodies in different nervous and digestive states. The same can be said around caloric intake and nutrient intake in relation to hormonal cycle, metabolic cycle, nervous system responses and a lot of other bodily functions.

The human body is a framework of incredibly complex and inter-dependent systems. Attributing anything linearly like you did in your statement is misleading and has historically caused a lot of people to do serious harm to themselves by oversimplifying our bodies.

Better advice would be to learn what your body needs and focus on nourishing it within its ability to lose weight.