Author: Ting Lei

1. Introduction

Obesity is one of the biggest health problems across the United States. According to the data from the National Health and Nutrition Examination Survey:

• More than 1 in 3 adults are considered to be obese.
• More than 1 in 20 adults are considered to have extreme obesity.
• More than 1 in 6 teenagers age from 6 to 19 are considered to be obese.

Obesity is usually accompanied with various other diseases, which combined kill millions of people per year. These diseases include type 2 diabetes, heart disease, high blood pressure, nonalcoholic fatty liver disease, osteoarthritis, cancer, stroke and various others.… Read more