> 2000 is pretty average, you dont need to make the post confusing by pointing out edgecases.

It's not "slightly different needs", it's 2000 +- 50%, just in the average population. For example, most women eating 2000 Cal/day are overweight (since women tend to have less lean body mass than men at the same height and exercise level).

> so the whole point in the last two paragraphs is based off of how much you eat.

No, the whole point is that appetite and digestion and lifestyle may well be affected by what you eat. So what you eat almost certainly influences how much you eat. The fast food burger could be the cause of you also craving the milkshake.

are you just replying to argue with some one? Im using your comment talking about 2000 calories.

Were also smart humans that can learn how to control our selves, thats education about food. How to eat filling food and not over eat. that all goes into education about nutrition

Education and willpower only work to some extent. People have a natural lipostat that "tells" them how much they should eat, and it's very hard to eat significantly differently - either more or less. What exactly changes this lipostat is not well understood, though there are well-known cases: lithium and other psychoactive medications, thyroid hormones. It is extremely likely that specific diets (in the broad sense) can also affect this lipostat mechanism - either directly, or through effects on the gut microbiome.