army1987 comments on Lifestyle interventions to increase longevity - Less Wrong
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Because people eat by servings, not by fixed numbers of calories. Comparing by semi-arbitrary servings isn't perfect, but it's better than not comparing by servings at all, and you haven't offered any serving sizes that you believe are better, so semi-arbitrary is the best we have.
Who eats 30 grams of spinach and then stops?
That doesn't mean that people don't eat by servings, it means that 30 grams isn't a good serving size.
Furthermore, since we're comparing different foods, the fact that 30 grams may be too small is compensated for by the fact that the serving size for milk is a cup, which is also too small.