While the toon has high nutritional value and health effects, but not everyone can eat. Because of the toon for the hair, people with persistent diseases are easy to induce disease after eating. Such as urticaria patients, allergic disease patients, asthma patients and some chronic disease patients, people who have suffered from serious illness should eat less or not eat toon.

In addition, kidney disease patients should not eat toon. Because toon contains a lot of oxalic acid, consumption will lead to the recurrence of kidney disease, or even aggravate the condition. In medical practice, it is not uncommon for patients with kidney disease to suffer a relapse due to the consumption of toon.