No one can force you to follow them, I managed to get one or two quite spammy people following me so I unfollowed them because I didn't want my feed cluttered. I think as well, you can click on various tags in your feed so you can look at categories of stuff in it like art so if you want to only look at certain stuff on a day you can.

Edit: Correction, I was wrong, can't do that, but it would be a nice feature to help deal with the mess on your home feed.