Answer:
Sentence 2 provides supporting evidence for the reason stated in sentence 1.
Step-by-step explanation:
If you take a look at sentence 1, you will see that it is a fact that the author wanted to state in his or her essay, and that is that too much sugar leads to health problems. In order to support this fact, the author gave examples, or evidence, to show what those health problems may be - obesity, tooth decay, diabetes, etc. So those examples are proof for the claim in the first sentence.