In most cases, primary food production occurs in a process called photosynthesis, which is powered by sunlight. In a few environments, primary production happens though a process called chemosynthesis, which runs on chemical energy. Together, photosynthesis and chemosynthesis fuel all life on Earth.
Eat 5 â 7 servings of meat and beans per day. This depends on the total number of calories you consume in a day. 1  If you consume 1600 â 1800 calories, eat 5 servings per day. 2  If you consume 2000 calories, eat 5 Â½ servings per day. 3  If you consume 2200 calories, eat 6 servings per day. 4  If you consume 2400 â 2600 calories, eat 6 Â½ servings per day.
The Harvard School of Public Health reports that most Americans consume well below the recommended number of fruit and vegetable servings in a typical day. Guidelines According to the 2005 Dietary Guidelines for Americans, you should consume between five and 13 servings of fruits and vegetables each day. This is equivalent to about 2 1/2 to 6 1/2 cups daily, depending on the amount of calories you need to consume for your weight and level of activity.