There would be so many things that I would want to pass on from thirty-five years in this industry. Work-life balance, alcohol, drugs, depression etc. are all important discussion points, but if I could tell myself something 35 years ago it would be "look after yourself".
But with hindsight, that wonderful thing, I wish I had looked after myself more - taken better care of myself, in a true sense. Just from a physical viewpoint, this job is brutal on our bodies. Working a 12-14 hr shift on our feet for 95% of it is no mean feat. Chefs have almost superhuman stamina, but we neglect to treat our bodies with respect to what we put them through.
To fuel this kind of exertion, our body needs the right kind of nutrition, and that is something that chefs are notoriously bad at. A properly balanced diet will go a long way to improving physical and mental well being. If we can work hard to provide a quality meal for someone, we don't know how much more we should take the time to give ourselves one too. Nutrition and hydration are essential, make them part of your life. Rest and relaxation are when the body recovers and repairs itself, missing this out results in a downward spiral.
We work and should enjoy the life we live in, but learn to look after yourself - accept that this is a hard brutal life, and train for it, make adjustments for it. Party hard with friends and mates, but don't live your life as a party animal. Have some respect for your body, your mind and your spirit and they will look after you for years to come. Don't underestimate the impact of what we do, remember to "look after yourself".