Question

why have obesity statistics increased to their current numbers compared to what they were years ago?
people have more knowledge of nutrition and taking care of their bodies today.
portion sizes have drastically increased over the years.
people are working out more than ever before.

Explanation:

Increased portion - sizes lead to higher calorie intake, which is a major factor contributing to the rise in obesity statistics. More knowledge of nutrition and increased exercise would typically lead to lower obesity rates, not higher ones.

Answer:

Portion sizes have drastically increased over the years.