In its plain form, tuna is a smart pick, not to mention one of the most wallet-friendly ways to eat healthy. One can contains fewer than 200 calories, has only about 1 gram of fat, and packs 42 grams of muscle-building protein. But turn your tuna into tuna salad, and that’s where things go downhill. A tablespoon of mayo adds 10 grams of fat, plus 90 extra calories. “Go for low-fat or fat-free mayo instead,” Zuckerbrot says. “And to cut back on calories even more, serve your sandwich open-faced on just one slice of bread. Even better, put that scoop of tuna salad over a green salad.”
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