Our sedate, modern lifestyle reduces the need for energy from food, which implies a lower food intake or obesity. Loren Cordain, PhD, and coworkers have estimated that hunter-gatherers had significantly higher energy needs than the typical modern office worker.  A lower energy intake generally reduces the absolute intake of all nutrients, while the need for some nutrients is not always reduced proportionally with energy intake. Overall this suggests that more exercise along with a more nutritious diet, including supplements of essential nutrients and less carbohydrates, will help to prevent obesity and maintain health.
An important take-home message is to focus on the types of foods you eat and your overall dietary pattern, instead of on individual nutrients such as fat, dietary cholesterol, or specific vitamins. There are no single nutrients or vitamins that can make you healthy. Instead, there is a short list of key food types that together can dramatically reduce your risk for heart disease.
Maintaining a healthy weight is important piece of the puzzle to achieve good health. A healthy weight can be determined using the body mass index charts (see web source below). If you find you are overweight or obese, weight loss may be beneficial for you. Before you begin any weight loss efforts, consult with your medical provider and/or consult a registered dietitian to create a weight loss plan. If you are underweight, consult a medical provider to assess your weight status.
Fats: Can they be healthful? Fats get a bad reputation but are necessary for good health. Different sources of food provide different types and amounts of fat. This article looks at which fats are actually good for you and how to go about replacing unhealthy fats with fats that are good for you, as well as the relationship between fat and weight. Read now
Dietary supplements are any substance that you take to improve your health or wellness. This includes vitamins, minerals, and herbs. The most common form is a pill, or capsule. You also can get them in powders, drinks, and foods. These supplements are not meant to cure diseases or health conditions. An exception is if the U.S. Food and Drug Administration (FDA) has approved it for a health claim.
The VITAL trial showed that neither vitamin D nor fish oil supplementation significantly reduced the incidence of cardiovascular disease (CVD). Conversely, current evidence supports the benefits of multiple dietary patterns, especially the Mediterranean diet, in primary prevention of CVD. Health effects of low-carbohydrate diets depend on the food sources of macronutrients.
Fiber is an important part of an overall healthy eating plan. Good sources of fiber include fortified cereal, many whole-grain breads, beans, fruits (especially berries), dark green leafy vegetables, all types of squash, and nuts. Look on the Nutrition Facts label for fiber content in processed foods like cereals and breads. Use the search tool on this USDA page to find the amount of fiber in whole foods like fruits and vegetables.
Dietary supplements are complex products. The FDA has established good manufacturing practices (GMPs) for dietary supplements to help ensure their identity, purity, strength, and composition. These GMPs are designed to prevent the inclusion of the wrong ingredient, the addition of too much or too little of an ingredient, the possibility of contamination, and the improper packaging and labeling of a product. The FDA periodically inspects facilities that manufacture dietary supplements.