Deep, old evolutionary programming tells us that eating Skittles is a good move. Sheryl Crow sings that if something makes you happy, ‘it can’t be that bad’. We need glucose to live, and it gives us pleasure. So it’s fair to wonder: what’s the big deal if we eat more? In some cases, more isn’t necessarily better. Give a plant too much water, and it will drown; give humans too much oxygen, and they pass out. Similarly, there is an amount of glucose that is just right for us: just enough for us to feel great, jump around, go to work, hang out with other humans, live, laugh and love. But we can
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