2200 calories a day

And you have no research proving its not both.

Because proving a negative..... but yea.

Also,

As a general rule, signals arising in the periphery that influence food intake and energy expenditure can be partitioned into two broad categories (Fig. 1) (1, 2, 3). One comprises the signals generated during meals that cause satiation (i.e. feelings of fullness that contribute to the decision to stop eating) and/or satiety (i.e. prolongation of the interval until hunger or a drive to eat reappears). The prototypical satiation signal is the duodenal peptide cholecystokinin (CCK), which is secreted in response to dietary lipid or protein and which activates receptors on local sensory nerves in the duodenum, sending a message to the brain via the vagus nerve that contributes to satiation. The second category includes hormones such as insulin and leptin that are secreted in proportion to the amount of fat in the body.

Here's the link to the full publication:
http://press.endocrine.org/doi/full/10.1210/jc.2008-1630

TLDR: Feelings of being full at the end of the meal are controlled by specific chemicals released from the digestive system that signal the brain to stop. It's called a negative feedback loop and its the basic system of control for maintaining homestasis in the body.

Finally the ability of the stomach to expand capacity due to increased appetite =/= an expanded stomach capacity CAUSES increased appetite.

Conclusions: Although progress on effective medical therapies for obesity has been relatively slow in coming, advances in understanding the central regulation of food intake may ultimately be turned into useful treatment options.

Satiation signals: summary of general principles
Satiation appears to be a complex phenomenon, mediated by a number of GI peptides. Although it is clear that the different satiation factors respond to specific nutrient stimuli (e.g. CCK to protein and fat, GLP-1 to carbohydrate and fat, PYY primarily to fat, and so on), it has not been proven that mixed meals of differing macronutrient content elicit the release of distinct cocktails of GI hormones. However, given the wide range of specific factors that seem to mediate satiation, it is logical to presume that this process is subject to highly refined regulation. Especially important is the modulation of the action of satiation by factors such as leptin and insulin that are responsive to body adiposity. This interaction is the critical site of endocrine regulation of eating and energy homeostasis.

The regular guy went first, and stopped after seven dogs (no buns, for purposes of the study) because he thought he’d be sick if he ate another. Using fluoroscopy, an x-ray that gives a real-time view of what’s going on inside the body, the doctors saw what you’d expect: His stomach was indeed full of hot dogs and hadn’t stretched much from its original size (see picture at left).

Then they looked at the competitive eater. First, they noticed that his empty stomach showed virtually no peristalsis, the normal squeezing motion that helps the stomach break down food. He started eating hot dogs and his stomach got bigger and bigger. Ten minutes in, he’d eaten 36 dogs. He said he didn’t feel full, but the researchers told him they’d seen enough.

speedeater_art_200v_20080702161545.jpg
Stomach of a champion eater, after eating 36 hot dogs in 10 minutes. (Image courtesy Marc Levine)
“His stomach now appeared as a massively distended, foodfilled sac occupying most of the upper abdomen, with little or no gastric peristalsis,” they wrote in their paper. Levine said the stomach was like no healthy stomach he’d seen in his 30-year career. He compared it to a “giant balloon that looks like it has no limit.” The eater’s previously flat belly swelled out as if he were pregnant.

The champion told the doctors he had “spent several years training for the sport, forcing himself to consume larger and larger amounts of food despite the sensation of fullness.” He said he never felt full anymore. They figured the training had somehow given the guy’s stomach this ability to expand indefinitely.

I this thread

I know right, it's semester exams here so I have lots of down time watching students scribbling on paper.

I this thread

I know right, it's semester exams here so I have lots of down time watching students scribbling on paper.

I don't know how comfortable I feel with you teaching our nations youth after getting a feel for your critical thinking abilities.

I have my doubts as far as your qualifications are concerned for sure.