The first point to support your statement is that chocolate makes you fat. Use prior knowledge to support this fact by saying that candy bars can contain up to 200 calories, contain fat and sugar, and thin people are vegetarians or athletes. Diego's second point is that newspapers are not always reliable. He uses examples from his own experience, the news going back and forth about the health benefits of red wine and the fruitless push for gluten-free food. His final point is that the study from the journal article was invalid. It uses evidence that testing only healthy people leads to biased results and the study should have included unhealthy chocolate eaters. Diego's first statement that chocolate makes you fat is almost correct. His first two points are valid, but his absolute belief that thin people are vegetarians or athletes is incorrect, weakening his argument. Your second statement that newspapers are not reliable is a good point, however using Facebook is not necessarily a good source. Your third point regarding the validity of the study is a great point. Because the study only used healthy people, the results regarding their body mass index were not very reliable. Arguing that the study should have included unhealthy chocolate eaters is a valid argument