Strictly speaking, nutritionists do not recommend a long-term, completely vegetarian diet. If someone wants to try it, they must also consider their physical condition at the time. Ceng Qingshan says that vegetarians must be healthy adults. The following groups of people are advised not to be vegetarian:
1. People who are naturally thin and have poor resistance.
2. All children in their growth and development period, as it can lead to poor development.
3. Women planning to conceive, as a regular vegetarian diet can lower estrogen levels and cause fertility problems.
4. Women during their menstrual period and postpartum confinement period.
5. Menopausal women, as it can worsen "menopausal syndrome".