Tea cantains much acidum tannicums and theophylines.

After acidum tannicum enters in the gastrointestinal tract,it will refrain the secretory gastric juice and intestinal juice which are indispensable in digesting food;moreover,acidum tannicum will take a solidfication effect in the protein of meat,eggs,bean products and dairy products becoming the indigestible acidum tannicum protein coagulum.The more you have protein and thick tea,the more serious it will be.

A large amount of acidum tannicum may  have so strong a stimulate effect on gastric mucosa that will not only cause the funciton of stomach be out of gear and indigestion but also stimulate the gut mucosa thus it will prevent the gut from absorbing nutrients.Besides,the theophlines in tea has the effect of refraining small intestine from absorbing iron.

The experiment by the scientist indicates that drink  tea water with drawing fifteen grams of tea after meals will reduce half of the amount of iron absorbed in foods.

Somebody take it as a effective method of losing weight and facial beautification just for considering that drink a cup of tea after meals has the feature of affecting the body disgesting and absorbing nutrients in foods.However,it is possible to cause  harmful consequence of disordering the function of stomach and intestine and malnutrition.

We often see somebody have the habit of drinking a cup of tea either after or before meals.

Similiarly,drinking tea before meals will also prevent  digesting and absorbing foods. In addition , tea will stimulate the taste cell inside oral cavity, so it can weaken the sense of taste and decrease the secretory saliva ,therefore  the following diet will be made tasteless.

Detail to warn:

Long time drink thick tea before and after meals will bring about harmful results of indigestion,constipation,dystrophy and anemia etc.Hence,it's not fit for drinking tea after meals within an hour and before meals within half an hour.