I would say three things are really important in the following order: 1. Sleep. 2. Diet. 3. Acitivity. Sleep: If there's one thing that you can change to ma

I would say three things are really important in the following order: 1. Sleep. 2. Diet. 3. Acitivity. Sleep: If there's one thing that you can change to make you feel a lot better its going to be this. Always get whatever your body needs, for me thats around 7-8 hours. (see: http://www.health.com/health/gallery/0,,20459221,00.html http://www.health.com/health/gallery/0,,20459221,00.html) Diet: Drink lots of water and eat healthy i.e. lots of veggies and fish. Avoid sugar and junk foods as much as possible. I was skeptical about the sugar too, but I've noticed a huge boost in energy and overall alertness once killing the sugar habit (see: http://www.webmd.com/food-recipes/your-brain-on-sugar http://www.webmd.com/food-recipes/your-brain-on-sugar) There are also specific foods that are better than others, but the main thing you want is to make sure you're getting all the essential vitamins your body needs - and not by taking a multivitamin supplement. Here's a good list of the health http://www.realsimple.com/health/nutrition-diet/healthy-eating/the-30-healthiest-foods http://www.realsimple.com/health/nutrition-diet/healthy-eati... Activity: This doesn't mean working out hardcore or even 3x a week or whatever. Just find a routine that works for you - make sure its regular - and do it. For instance, go swimming once a week, or take a hiking trip the first of every month. Just pick something active that interest you and make it into a habit. Also make sure you life style in general is a pretty active one. Are you watching TV every night? What if you finally started building that workshop you've always wanted instead? Here are some other tips I've noticed that help me feel WAY better: 1. Don't sit at a computer all day long :) Find a time period that works for you and if possible work in intermittent sprints - for me I can have peek performance and concentration for between 2-3 hours after that I start fading. So just take a break then, go shopping, mow the lawn, read a book, whatever needs to be done. I realize this is hard to do if you have a 9-5 but still even a 10-15 minute break to drink tea and listen to some music can be enough to give you a boosting refresh. 2. Do everything you can to minimize stress in your life. If you have a stressful job or work environment seriously try to change that, (see: http://www.webmd.com/balance/stress-management/features/10-fixable-stress-related-health-problems http://www.webmd.com/balance/stress-management/features/10-f...) 3. Don't live a repetitive lifestyle. Do something new at least semi-regularl. Go to a meetup for a first time then maybe give a talk, go rafting on a weekend or just read a fiction book you've been wanting to read for a while. I've noticed that doing new things can really give your mind and body a fresh start and help out with the every day grind of things.