Human beings are the most omnivorous creatures on earth. We eat thousands of different foods. But all of this variety can be organized into just a few basic food groups. The simplest classification system contains only four categories: meat, fish and eggs; dairy; grains; and vegetables and fruits.
The foods belonging to each of these categories tend to affect the body in different ways. Some of these effects have a bearing on weight management. Dieters and triathletes seeking their optimal racing weight often manipulate the various food groups, eating more of some and less of others, and sometimes even eliminating one or more.
Some ways of manipulating food groups for weight loss are more effective than others, while there is no single best way to do it for everyone. A clear understanding of the relationship between each food group and body weight will help you make the best choice for yourself.