Fruits contain brass-like compounds, which are converted into dihydroxy benzoic acid by intestinal bacteria after ingestion, while vegetables contain thiocyanate, which interfere with thyroid function under the action of these two chemicals and can lead to non-iodine goiter.

Don't drink tea right away

Because the tannins contained in tea combine with protein and iron in food to form colloid or precipitate which is not easily absorbed, iron deficiency anemia and protein's disease may occur in the long run.

Don't smoke at once.

Because the stomach peristalsis is accelerated after meals, blood circulation is increased, and capillaries are dilated, which promotes the absorption of harmful substances in cigarettes. Smoking after meals absorbs more than ten times the harmful substances in cigarettes as normal smoking. Please pay attention to your health.