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.
Added fats provide calories, but you need to limit your intake to four to six servings a day to help limit malabsorption. Healthy fats and serving sizes include 1 tsp. of butter, margarine or oil; 1 tbsp. of low-fat mayonnaise; 1 tbsp. of salad dressing; 2 tbsp. of low-fat salad dressing; or 1 tbsp. of gravy.