this post was submitted on 06 Jan 2025
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There's almost some truth to it. Certain foods, like salts and carbs, in certain situations, like low salt/carb diets, can have a ripple effect. 100g of carbs, or a few grams of salt, can cause your body to retain water. The effect being that you gained several pounds from eating just a few (hundred) grams of certain foods.
However, for your body to retain that water, you must also consume said water.
Though even in that case, I'd consider water consumed to be covered under "food".
The only exceptions I can think of are from gaining mass from things other than what you eat. Like tar buildup from smoking, snorting or injecting various substances, boffing something (I think that's what it's called... Up the butt instead of out the butt), things sticking to your skin, absorbing through the skin, or bugs/aliens laying eggs inside you. Maybe getting possessed by a ghost, if ghosts have mass. But I don't think all of those combined would even come close to a single meal, other than extreme cases.
I was curious and looked into how much mass the average adult loses through breathing, and apparently it's at least about 69g (at rest, if you are metabolizing fat).