Functional drinks contain caffeine, which is a central nervous system stimulant and can temporarily drive away drowsiness and restore energy. However, if people often drink functional drinks containing caffeine, it will play an inhibitory role, leaving the central nervous system in a state of excitement for a long time, affecting the normal sleep of the human body.

2. Side effects on the heart and blood pressure.

Functional drinks contain more sodium and other elements. If people eat them for a long time without lack of nutrients, it will increase the burden on the human body, leading to a heavy heart load and an increase in blood pressure.

3, vitamin poisoning

Although functional drinks can supplement vitamins, if people eat them for a long time without vitamins, it will cause vitamin poisoning and lead to hepatitis and other diseases.

4, damage to dental health

The main components of sugar and acid in functional drinks are citric acid and ascorbic acid, which will corrode the enamel on the surface of teeth, damage the health of teeth and lead to tooth discoloration.

5. Malnutrition

The sugar contained in functional drinks will make people feel full, which will affect people's appetite and digestion and absorption. In the long run, it will lead to malnutrition and dehydration.