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.
By Shibin Zhang Submitted On May 17, 2011. When I first came to England, I was very confused when people asked me how many meals per day do Chinese people usually have. I would simply reply: obviously three, but don't you have the same?. Later on I found out that I wasn't right. Of course, different cultures have different eating habits (in Spain, people usually eat five times a day).