CW: references to eating disorders
I’m health class in high school we had a unit on eating disorders and one thing I remembered learning was that people with bulimia tend to be “normal” or “over” weight (as compared to those with anorexia) because food begins being absorbed as it’s in your mouth so even if you binge and purge you can still gain weight. I get that you can’t throw up *everything* but I don’t understand why purging food before it gets completely digested by the stomach and stuff doesn’t get rid of the calories?
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There are two matters to address here.
The first is that your body can indeed absorb a small amount of nutrition directly from your mouth. Enzymes in your saliva start breaking down starches the moment food hits your mouth, and some nutrients (mostly simple sugars and some vitamins, as well as many drugs) will dissolve in it and can be directly absorbed through the thin skin in your mouth.
The second is that your health class seems to have misrepresented bulimia, possibly dangerously. The amount of nutrition you absorb through your mouth is negligible, not nearly sufficient to maintain a healthy weight, let alone an unhealthy one. Even if you spent all day swishing sugar syrup in your mouth, it wouldn’t be enough.
Some people with bulimia are not underweight because they do not purge every meal, and because purges are not always complete. It typically takes about 30-90 minutes for food to pass through your stomach into your intestine; many meals are longer than that, so a hypothetical bulimic might get some food into their small intestine for nutrient absorption before they vomit.
**PLEASE NOTE** Even if someone is not underweight, that does not mean that they are healthy! Bulimics can have serious nutrient deficiencies, and the constant vomiting can be damaging to your throat, mouth, and especially teeth!
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