A sore stomach cannot digest food well, and so the whole body becomes sick and weak.

What would you think of a man who should keep his eyes always sore and inflamed and finally destroy his eyesight by putting pepper or alcohol or some other irritating substance into them every day?
Is it not equally foolish and wicked to injure the stomach and destroy one's digestion by the use of alcoholic drinks?
Alcohol, even when it is not very strong, not only hurts the lining of the stomach, but injures the gastric juice, so that it cannot digest the food well.
~17.

Effects of Alcohol upon the Liver.~--The liver, as well as the stomach, is greatly damaged by the use of alcohol.

You will recollect that nearly all the food digested and absorbed is filtered through the liver before it goes to the heart to be distributed to the rest of the body.

In trying to save the rest of the body from the bad effects of alcohol, the liver is badly burned by the fiery liquid, and sometimes becomes so shrivelled up that it can no longer produce bile and perform its other duties.