No more than 30% of your total calories.
Answer - Yes
Reasoning - There was a case and study of germs had cause cancer which is stomach cancer. It was studied by Barry Marshall (1983) which the bacteria is called helicobacter pylori that can cause cancer in stomach.
You didn't provide any concepts? How our lives are best conceptualized and which aspects encompass them best is a good question to pose and hard to answer at the same time. One might say that there are hardly enough concepts which can thorooughly explain what our lives are about.