Sentence 1: Ron decided to become a vegetarian. 
 Sentence 3: It didn't leave him a lot of food to eat that would provide proteins 
 Sentence 4:  In the end, he had to give it up for health reasons 
 Sentence 5:  He went back to eating meat and regained his strength right away 
 Given Sentence 2: They had a speaker who was going to talk to them about fire safety.