Those three things are good and can go a long way towards helping out, but they are not perfect. Most especially they suffer from a bootstrapping problem. If yo

Those three things are good and can go a long way towards helping out, but they are not perfect. Most especially they suffer from a bootstrapping problem. If you're too depressed to take care of yourself by keeping your sleep on schedule, eating right, and exercising regularly you absolutely will not have the energy or motivation to get back into them easily. Additionally, some people have other issues that make those things harder, such as medical or physical reasons they can't exercise, or sleep disorders (which have a high degree of comorbidity with depression and bipolar). I'd highly suggest that people look at mindfulness based cognitive therapy. That can build the tools that will make it possible to get back on track. It can also make a huge mental difference to bring people from "kinda sad but doing ok because of good sleep/diet/exercise habits" to actually being able to enjoy life.