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Protein bars, protein flapjacks, protein granola, protein ice cream and protein coconut water... To look at the health-food aisles, you'd think that protein was a substance no one could overeat. Even bread now comes in protein-enriched form.

In terms of personal choices, let's all think more carefully about where we get our protein from.

As people around the world become more affluent, they are demanding diets richer in animal protein, which will require ever more robust feed crop yields to sustain.

Agriculture as we know it needs to disappear. We can design better and healthier proteins than we get from nature.

For a slim, sexy body, it's important to eat protein every day - preferably at every meal. Be sure to ask about the origins of your meat, poultry and seafood. If you can't afford organic, free-range meats, opt for natural poultry, pork, and beef that's raised without antibiotics or hormones.

I grew up in financially straitened circumstances and meat, which was expensive, was a rare thing at mealtimes. We ate meat about once a month, if that.

I'm on my version of the protein diet, but there ain't no protein in it. It's a Krispy Kreme doughnut between two Cinnabons. And you soak it overnight in Red Bull. Then you chase it with a Snickers.

There are a lot of great things about food, but it's something that's an eternal struggle in our contemporary society, where and how food is made, where it's coming from, how much to consume. There are so many layers to it.