I make a document/book on weight loss of about 20 pages, and I think of the font and size I should use in headlines and body text? The document will be available via pdf-file, so it should be easy to read both on screen and printed.
MS Word standard is Calibri on the body text and Calibri Light on headings. Is it safe to go with it or do you have any other suggestions? Personally I think is a bit too weak for the headlines but has no other ideas.