- He skips meals to do research, and now average a-meal-a-day only. He would cook 3 meals per week, and starve himself until the 3 meals lasts the entire week. He wasn't like this last year, but I guess pressure from boss can easily destroy your lifestyle, especially you are getting paid $30k a year, a luxury sum for a post-doc.
- He makes minimum contact and friends except colleagues in the lab. He makes no attempt to make new friends except colleagues. But I guess when you need full front concentration on research, this is the result you would have. I'm making minimum contacts as well, especially friends of opposite sex, which would mean a lot more time spent if you are in a relationship.
- He spends frugally. Unless necessary, spending is restricted only to meals and weekly grocery bills. Again, I'm doing that since being a student, full concentration is necessary, and others are just luxury. I just hope I can be like that for another four years in the Ph.D. program.
But, of course, some people is special and their lifestyle greatly differs.