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A lot of times, we underestimate how much we're really eating because it's so difficult to intuitively gauge what an appropriate portion of food is.
"Most people think of a bagel or two slices of bread that enclose our sandwich as being one serving," says Margaret Kocsis, M.D., author of Savvy Eating for the Whole Family. "However, they are two servings." A large, white sub roll can be four servings of nutritionally empty calories.
You may automatically assume that the restaurant steak would constitute a serving. "However, steaks are often two, three, or even four three-ounce servings," Kocsis points out.