Answer:
water! water is very essential, one reason being that it flushes out toxins from the body.
The answer to your question is


As you get older many nutritional dilemmas start to pop up, such as loss of appetite, depression, menopause/prostate problems, heart disease, less taste, etc. All of these affect their nutrition and put them at risk for deficiencies.
I hope this helps you!
Gravity and Inertia is the answer
There are two types of drugs: Legal drugs are known as over-the-counter (OTC) and prescription (Rx) drugs. Alcohol, nicotine, and caffeine are all legal drugs as well.
The stimulant you are describing is methamphetamine aka meth.