Please analyze the following cause-effect:

When I eat too much food and do not exercise, I gain weight. "What is causing effect Y"?

The analysis should have the following structure:

1) Issue: "What causes effect Y" (e.g. What caused my flat?)

2) Examination of assumptions, observations, evidence, and information.

3) Formulate the hypothesis

4) Examine evidence that confirms or disproves your hypothesis.