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A trans fat molecule is the hydrogenated form of a regular fat molecule. Foods containing high amounts of trans fat are very unhealthy as they raise LDL levels, can cause coronary heart disease, and may lead to obesity. Therefore, a healthy diet should be completely void of fat.
The argument is flawed primarily because the author
The statement about the effects of trans fat is a premise (B) so first of all, it should be regarded as true. Secondly, it does not overgeneralize since it does not force one case to include all other cases. Instead, it specifically relates to one subject - trans fat.
The argument deals with dietary issues, not health in general. Although it is true that exercise is a big part of being healthy, it is not logically required to refer to exercise while discussing diet.
A conclusion can be formed without presenting an actual case. Examples and cases are a great way to strengthen a conclusion. However, a logically sound connection between the premises and the conclusion is enough to present a coherent argument.
The statement about LDL levels is a premise. We should accept it as factual information that is true. Therefore, additional scientific evidence is unnecessary.
Trans fat is really bad. The premises in the argument make this point clear. However, the conclusion refers to all kinds of fat. Since there is no information about other types of fat, and their effect on our health, the statement that all fats (other entities in the same group) should be avoided is not logically supported.