求指教啊，一篇AWA作文，下周考试，想死中。。。

In this passage, the author compares sugar and theartificial sweetener aspartame based on their effects on weight change. He exemplifieshow sugar could lead people to lose weight and how aspartame could have theopposite effect, concluding that people who want to achieve dietary goalsshould not consuming aspartame. From my point of view, the author does notprovide concrete evidence to justify whether people should or should not chooseaspartame if they want to lose weight, and fails to consider the dietary goalsof different consumers.

First of all, the evidences used to indicate the functionsof sugar and aspartame is not thoroughly convincible, since the author does notfully discuss the details. Granted, the use of aspartame could lead consumersto be craving for foods, but such effect is resulting from high levels ofaspartame. In other words, if people consumer normal amount of aspartame, theymay not have similar experiences, or gain weight. Therefore, the author shoulddefine the standard of high levels and normal levels of consumption, and find away to convince people that even normal levels of consumption may have the sameeffect; otherwise, there is no sufficient evidence to persuade rationalconsumers to stop eating aspartame.

Second, the author simply provides an example, which isabout the way sugar can help people burn fat, to claim that sugar is betterthan aspartame, leading to a gratuitous assumption that every person canbenefit from sugar, and that sugar has such effect under every circumstances.Only list the time restriction implies that other factors, such as theconsumption level of sugars, and sources of sugar, would not affect the result.However, is it true for people if they continually have high levels of sugar ingestionafter exercise? Also, if people's bodies are highly sensitive to sugar's ingestion,would they burn too much fat and hurt themselves? Author has to address similarissues to present an unbiased evaluation.

Third, dietary goals may vary for different individuals:people who have obese may need to lose weight, and people who have eatingdisorders may need to gain weights. Accordingly, if it's true that sugar andaspartame can significantly attribute to gain and loss weight respectively,people may still want to choose either one to meet their specific needs.Therefore, simply assume a solid goal for every consumer is not reasonable.

In conclusion, the author should address the above problemsto better compare the two substances, and he needs to be fully aware ofdifferences among dietary goals to avoid marginalizing certain groups ofconsumers.