1. Nutrition & Hydration – the body is 70% composed of water, and it’s involved in almost every systemic function – ensuring the appropriate level of hydration prior to your workout lifts your training efficiency, and enables your body to make full use of its fuel for your session. Eliminating refined sugars, going low-GI, opting for a diet rich in lean proteins, pursuing healthy fats (think avocados, olive oil, and fish) & eating little-and-often through the day are the best way to regulate sugar levels.
Nix nighttime eating. This one is less about science and more about psychology: humans have a tendency to eat the worst stuff (and/or the most) at night. So if you swear to yourself that you won't eat past 8 PM, those late night taco runs won't be happening. And when those late nights roll around and tu quieres tacos but you opt for that glass of water instead, that's poundage falling off. It's tough socially, but it's worth it.
But in today's unenlightened "believe everything you hear" age this most effective and proven approach, for some strange reason, does not seem to attract much interest. This is no more obvious when one witnesses the "technological" revolution that is happening within the fitness industry, where a newer even more ridiculous gadget compared to the one that preceded it promises to build you the body of your dreams, with little effort on your part, "in 30 days or your money back"; where a machine that does most of the work for you is touted as a suitable replacement for actually applying a modicum of effort. https://www.youtube.com/watch?v=mDHGaU_jGrQ