Nuts! To Health
September 2010
Nuts (and seeds) are healthy foods that are rich in unsaturated fats, magnesium, and copper, with smaller amounts of protein, fiber and iron. But they’re also high in calories, a quarter cup (about one ounce) providing over 200 calories, with almost eighty percent of their calories coming from fat. So how can this high fat, high calorie food be good for your health? And your waistline?
A recent review of scientific studies showed that people who ate a one-ounce serving of nuts on five or more days of the week had a reduced risk of heart disease compared with people who consumed no nuts (British Journal of Nutrition, 2006). The nuts in the study were those commonly eaten in the US – almonds, hazelnuts, cashews, pecans, pistachios, walnuts and peanuts. On average, these nuts contain mostly monounsaturated fat (59%), some polyunsaturated fat (27%), and just a little saturated fat (14%). Unsaturated fats are the healthy fats that help lower cholesterol levels in the blood and improve overall health. Health benefits were especially associated with walnuts and almonds. In numerous studies, when walnuts or almonds were substituted for other fats in the diet, participants LDL cholesterol (the bad kind) and total cholesterol levels dropped, and some showed a rise in HDL cholesterol (the good kind).
Nut eaters tend to be leaner, non-smokers and more active than non nut-eaters. There is some preliminary evidence from studies that eating nuts regularly may lower triglycerides (fat in the blood), raise HDL cholesterol, reduce inflammation, and relax artery linings. Nuts may protect against heart disease and other chronic diseases by providing fiber, vegetable protein, and the antioxidant vitamin E, as well as other phytochemicals that act as antioxidants. Antioxidants clear out the free radicals and other damaging substances that are by-products of our metabolism of food.
The recommended amount of nuts to include in your daily diet is about one and a half servings, or a quarter cup. This will add 250 calories to your daily intake, so make sure you compensate by eating less of something else. The type of nut you choose doesn’t seem to matter, but limit the amount of Macadamias and Brazil nuts, since they have a higher ratio of saturated fat to polyunsaturated fat. Try to choose raw or roasted nuts with little or no salt added. Roasting nuts in oil doesn’t appear to change the calories or the amount of saturated fat in them, so roasted either with or without oil is fine. Portion control is key – don’t buy a large tub of nuts if you can’t stop at a quarter cup. Or place premeasured nuts in a bowl for a snack. Be careful with nut mixes, as many have added ingredients that increase the calories, sugar and salt content.
Nut butters, including peanut, almond and cashew butters, haven’t been studied to measure if they impart the same health benefits as whole nuts. Plus, many add in other ingredients and unhealthy hydrogenated oils, so read the label before you buy.
Homework: One of the cheapest and easiest ways to eat nuts is to buy them raw from the bulk section of the grocery store, and dry roast them at home in your oven. Preheat your oven to 425 degrees, set raw nuts on baking sheet (you can also lightly coat the nuts with vegetable oil and add small amount of salt if you like) and roast for 5 – 10 minutes. Be careful not to over roast as nuts keep cooking after you take them out of the oven because of their high fat content. They should be fragrant and lightly brown when done. Enjoy!