I expect you're already pretty aware of many of the life-style factors that affect the health of your heart. You'll know, I'm sure, how much sense it makes to eat and drink more of the right things and less of the wrong. You'll be aware that smoking isn't the most helpful of vices to have. Too much stress is bad for your heart. Exercise is good for it. And so on, and so on.
We take for granted the fact that we need to adopt a holistic 'whole body' approach when it comes to cardiac conditioning: so why isn't it always as obvious to us that our emotional wellbeing can be every bit as much influenced by our all-round physical health?
While it may be an overclaim to suggest that depression can be somehow 'cured' by adopting a healthy lifestyle, it certainly does no harm to take care of your body if you want to take care of your mind.
Eat healthily. I'm sure you know what's good for you and what isn't.
Drink sensibly. This means alcohol only in moderation (if it's your thing) but plenty of glasses of water.
Exercise regularly. Every little helps. This doesn't necessarily commit you to a gym membership, but it does mean walking whenever you can. A little faster than usual is always a good thing.
Aim to get a good night's sleep. I know this is not easy for many, but it may help to start winding down a good hour before bedtime, to avoid caffeine in the evening, to eat at least two hours before retiring, and as far as possible to aim for consistent going-to-bed and getting-up times.
Your body and mind are intimately connected. Look after one and you'll also be taking care of the other.