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.
1 It's typically recommended to consume about 5-9 servings of fruits and vegetables each day. When you eat these foods at each meal and snack, you should be able to consume the recommended amount.  One serving of fruit is about 1/2 cup chopped or 1 small piece. One serving of vegetables is 1 cup or 2 cups of salad.