In recent years, with the improvement of people's requirements for self-figure, sugar-free drinks have become an essential artifact for many bodybuilders. Aspartame is often used as a substitute for sugar, and it also exists in the ingredient list of many foods. There has been a debate about aspartame, so is aspartame safe? Aspartame will be decomposed into methanol and two amino acids: aspartic acid and phenylalanine in human body, and methanol will be metabolized into formaldehyde and formic acid. Drinking diet coke won't make people stupid, but inside, caffeine and aspartame will affect people's nerves.

The whole metabolic process is very mild in human body, and it will not produce a large amount of methanol to cause human poisoning. In addition, many foods we usually eat will also produce the same or even more methanol during metabolism, such as citrus and tomato. There is no difference between the methanol produced by digestion and absorption of these foods and the methanol produced by aspartame.

Organizations such as the US Food and Drug Administration (FDA) and the Joint Expert Committee on Food Additives (JECFA) all said that the safety of aspartame as a food additive is reliable. For the average person, the daily intake level of 40 mg per kg body weight is very safe (for a person weighing 60 kg, this intake is about equivalent to 13 cans of sugar-free drinks).

The evaluation based on the research evidence also denies the rumors that aspartame is "carcinogenic" and "damaging the nerves". Except for patients with phenylketonuria, ordinary people do not need to worry that aspartame will harm their health.