In truth you body has the ability to heal itself and works properly, many people in india does not eat and are healthy.
Scientist comes up with every new thing every other day and then same scientist tells you no it is not good for your health but you ahve to realize they are just experimenting and I am in this line so trust me most of the time we are not sure either.
you can search internet and you will find many people are breatherian which means they don't eat of drink and live on prana.
Back in punjab we had a female in our village and she did not eat for more than 30 years and was healthy and I used to think no she eats when nobody watching lol but Now I know better.
Placebo effects works with just a belief system of human, you can give sugar pills to people and tell them they will work like gold for your heart and just made them pay huge amount of money and I gurantee you it will works.
I was reading a book holographic universe, Its a good book based on science, give it a try it explain alot about human mind and how we are the one who influnce ourself.
and about beer thing lol, I agree too I am health freak so I search stuff and they were telling how one cup of red wine is good for health and I was like naw i'll pass it lol