Childhood obesity is a very real concern

Childhood obesity is a very real concern. What are some of the factors that have contributed to this epidemic? Should people have the right to make their own food choices, even if they are unhealthy ones, or is it the government’s responsibility to legislate healthy food choices (like limiting the size of sodas in New York City or banning sweets in school cafeterias) in order to prevent obesity-related health issues? (Provide references for explanation)