Think back to your last meal: How many servings of meat did you eat, on average, per day? Honestly, do you know how big a serving size of meat is?

I’ve heard that a serving size is equal to a deck of cards — or maybe it’s the size of my palm? — but I don’t measure before I eat. I just eat.

And does pizza count as a meat, veggie or dairy serving? Or all three? Because I’m not too proud to admit that I probably eat pizza at least once a week.

Yes, these questions are ridiculous. And if you’re like me, you’ve got a million-and-one things to do today, and counting how many...