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The article mentions that the potatoes and beef were organic (I assume as in organic food):

> Carmody fed adult, male mice organic sweet potatoes

What is the significance of this?

I'd assume making them organic helps to control for a pesticide or herbicide in them that could be changing the result. Not the best control but better than nothing.

I would assume the molecular makeup of food is modified by what you use to grow it. An organic potato might be smaller and more nutrient-dense than a chemically-grown one.

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