The fish that ate the rubber were thinner.
Could this not be due to the fact that a zero-calorie, zero-nutrient substance was in their stomach taking up space?
This is no different that one person eating a 12oz steak, and another person eating a 4oz steak and drinking 3 glasses of water to fill the rest of the space.
No different than going on a diet - control portion size and you'll decrease weight.
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