The Good News About Nuts & Seeds

Eat Fat or Don’t Eat Fat, That is the Question

The major determinant of your long term health is the nutritional quality of the calories you eat. It is the quality of the fat you eat, the quality of the protein and the quality of the carbohydrate that influences your health.

Ask yourself, is the food I am about to eat a whole, natural plant source of calories? Is it packaged with fiber, antioxidants and phytochemicals? Does it contain not just discovered nutrients, but plenty of undiscovered nutrients too? Or were most of those fragile, but beneficial nutrients lost in the way the food was processed or prepared? These are the questions, to ask yourself, not whether it is a low fat or high fat food.

You may have heard that nuts, seeds and avocados are fatty and fattening and are foods to be shunned. However, recent evidence from many different studies showing a wide variety of health benefits from eating these foods has finally buried this myth. It is important to emphasize that the health problems associated with high fat diets are from consuming animal fats, processed oils and trans fats, not from the consumption of avocados, and raw nuts and seeds. There has never been a study that showed any negative health outcomes from consuming these natural, high fat, whole plant foods. In fact, the studies that have been done only show positive health benefits, and conclude that these foods should be an important part of a well-rounded, healthy diet.

Macronutrients are the three sources of calories—fat, carbohydrate and protein. Americans eat too much of all three and we need to reduce all of them. I intentionally do not give a preferred percentage of each macronutrient in the diet and I do not recommend fat be significantly limited. Trying to micromanage the precise amount of each caloric source misses the most critical issue in human nutrition. The real critical issue in human nutrition is meeting your macronutrient needs without excess, for all three macronutrients, and getting sufficient micronutrients in the process (vitamins, minerals and phytochemicals—the parts of food that do not contain calories). There is a broad acceptable range in the macronutrient ratio as long as one is not overeating calories.

However, adhering to a diet that is less than 10 percent of calories from fat is not an appropriate recommendation for ideal health and often results in less than ideal health outcomes. One could be on a healthful diet that is 15 percent of calories from fat or a healthful diet that is 30 percent of calories from fat too. As long as the diet is rich in micronutrients and does not exceed our need for calories, the lower fat diet has no advantage in the prevention and treatment of disease. There is no evidence to suggest that a diet of equal calories that is much lower in fat is an advantage for prevention or treatment of heart disease or any other disease. Studies that compare dietary fat percentages suggest that it is not the fat level, but other more critical qualities that make the diet more or less beneficial.

To achieve an ideal level of phytonutrients and other micronutrients it necessitates eating a large amount of green vegetables each day. Any diet that does not recommend sufficient consumption of vegetables is lacking. When you eat lots of vegetables, especially green vegetables, you meet your body’s need for fiber and micronutrients with very little calories. Then to comprise the balance of the diet and fill our caloric needs we can choose an assortment of other foods, preferably ones that are of the highest nutrient quality. Unlike some other doctors and authors advocating a plant-based diet, I recommend more vegetables, fruits, beans, nuts and seeds and use less bread, potato, and rice. With the addition of nuts and seeds, which average about 175 calories an ounce, one or two ounces a day brings the diet up to the 15 – 30 percent of calories from fat range. My recommend diet is definitely not under 10 percent of calories from fat and because of the addition of seeds and nuts it is also considerably higher in protein too.

It might seem logical to restrict higher fat foods like nuts seeds and avocado because high fat foods are higher in calories and fat is 9 calories per gram compared to 4 calories a gram for carbohydrates and protein. Of course one should take care not to eat too many calories and adjust the level of these foods to maintain a slim body and not to overeat on them or any other food. However, there are lots of good reasons to include at least some of these higher fat foods in one’s diet.

Evidence is accumulating that a diet as low as 10 percent of calories from fat Is too low, even for the overweight, diabetic or heart disease patient and that the judicious use of these higher fat foods is beneficial for not just heart disease, but for weight loss and diabetes too. The scientific literature corroborates my clinical experience over the last 15 years caring for thousands of patients with obesity, diabetes and heart disease, and provides evidence to show that for every calorie removed from the diet from rice, potato, bread or animal products and substituted with raw seeds and nuts you get many health benefits, such as:

• Lower blood sugar
• Lower cholesterol
• Lower triglycerides
• Better LDL/HDL ratio
• Better antioxidant status
• Better absorption of phytochemicals from vegetables
• Better diabetic control
• Lower weight
• More effective reversal of heart disease
• Prevention of cardiac arrhythmias in heart patients
• More weight loss, not weight gain
• Better nutritional diversity and satisfaction with less calories
• Increased protection against cancer
• Better muscle and bone mass with aging

With the growing awareness of the health properties of nuts and seeds, we must also realize that they must be eaten in moderation. Should we all sit in front of our TV’s, eat the entire bag of nuts in an hour, and complain when we gain weight? Of course not. Healthy eaters avoid excessive calories and do not eat for recreation. Eat only an ounce a day if you are significantly overweight, but if thin, physically active, pregnant or nursing eat 2 – 4 ounces according to your caloric needs.

Originally published September 30, 2009.