In terms of protein, total fat, and calories, 1 oz of nuts is roughly equivalent to 2 oz of lean meat plus 2 tsp of vegetable oil. Nonetheless, the health benefits of nuts are considerable, as Johns Hopkins nutritionist Lora Brown Wilder explains.

Ask any nutritionist today about nuts, and he or she will tell you they are good for you — in moderation, of course. That’s a whole new way of thinking about nuts, which for years were perceived as “bad” foods because of their high fat and calorie content. But a slew of recent studies have brought a better understanding of nuts’ health benefits. The turnaround has been so dramatic that packages of some nuts have labels approved by the U.S. Food and Drug Administration touting the possible heart benefits of nuts, and the most recent dietary guidelines mention nuts as good sources of protein and mono- and polyunsaturated fats.

Why Nuts Are Good for You

Nuts pack a powerful nutritional punch. Nuts contain monounsaturated fats, which help lower low-density lipoprotein (LDL, or “bad”) cholesterol and may raise high-density lipoprotein (HDL, or “good”) cholesterol when substituted for saturated fats in the diet. So it’s not surprising that several major studies have found that eating nuts significantly reduces the risk of coronary heart disease — by 25–50% in both men and women. One of these studies, the Nurses’ Health Study, also found that regularly eating nuts and peanut butter reduces the chance of developing type 2 diabetes by 21–27%.

Besides monounsaturated fats, nuts are rich in vitamins, minerals, and other substances that are beneficial to your health. For example, walnuts contain a type of omega-3 fat similar to fish oil, and almonds contain calcium and vitamin E. Nuts are also good sources of protein and fiber.

Nuts and Weight Control

It sounds paradoxical, because they’re calorie dense (160–200 calories per oz), but research shows that people who eat nuts tend to weigh less than those who don’t eat nuts. Possible explanations: Nut eaters may follow a healthier diet (lower in calories and saturated fat) than people who abstain from nuts, and those who are overweight may shun nuts because of their high-calorie content.

But other factors also may come into play. Nuts are quite filling because of their high protein and fiber content. In one study, subjects who snacked on nuts and peanut butter weren’t hungry for 2.5 hours afterward and, interestingly, spontaneously adjusted their calorie intake for the rest of the day so they didn’t consume extra calories.

Protein also requires more energy to digest than fats or carbohydrates, so you use up more calories in the process. Also, because people tend not to chew nuts fully before swallowing them, they aren’t well digested and some of the calories they contain may be lost in the stool.

Source: Johns Hopkins Health Alert, July 18, 2007 and the American Peanut Council Newsletter.