Turns out, there’s a lot of sneaky reasons why your memory might be suffering. Some have to do with bad habits like smoking or unhealthy eating. Others revolve around your mental health. INSIDER took at look at some of the biggest causes of memory loss. 1/ An unhealthy diet can play a role. Shutterstock Cookies, cakes, and everything else in the junk food realm might taste unbelievably good but they can have serious health consequences.