Nothing to worry about really except perhaps
Cholera
Clostridium difficile
Dysentery
Typhoid fever
Vibrio parahaemolyticus.
E-coli
Campylobacter.
Salmonella
A few nights/weeks in hospital should cure these. Indeed, most will have a very positive effect of helping with weight loss.
On second thoughts, maybe gloves are a good idea. If I really wanted a bout of any of these, I'd sign up for a weeks cruise.
I take it you never use public toilets? Never touch anything that someone else has touched? Always wear gloves?
Never touch money?