Can I eat this? What makes something edible

Can I eat this? What makes something edible

This year I learned that I could be part of the foraging wildlife. 

Throughout Buffalo berries on Amelachier bushes are ripening to a deep red. As I walk through the city and pass a bush, I take a few berries and contemplate the idea of edibility. How can I eat an Amelachier berry, but not the leaves? Why can we eat lettuce leaves, but not grass or maple leaves? 

What makes something edible? 

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