Being evidence-based is important, it means that you can be confident that the advice you give is based on facts, not opinions or, worse still, feelings. For example, any fitness or nutrition ‘expert’ who claims that weight loss occurs only when you control for insulin secretion is wrong. I can say that with 100% confidence because there is enough compelling evidence that shows that simply is not the case and that insulin-obesity hypothesis has NEVER been proven by science (1, 2, 3). Of course, the evidence doesn’t necessarily tell the whole story, but it can certainly show us when something is just plain wrong.
High intensity training or HIT, often referred to as HIIT which actually stands for High Intensity Interval Training has been presented as some kind of magic bullet for fat loss in recent years. I mean, I was even taught this when I first did my level 3 personal trainer diploma. The main reason we are told that HIIT burns more fat than other forms of exercise is because of something called Excess Post-Exercise Oxygen Consumption or EPOC for short. This is often referred to in more simple terms as ‘the afterburn effect’. The theory being that after a bout of very high intensity exercise you burn more Calories while you recover. Some sourced have claimed that you could burn an extra 1,000kcals over 24-hours. This is completely false. Let me explain more.
If you play sport or take part in some kind of sporting activity you probably do so because you enjoy being active, maybe your sport is your passion, your life purpose. But, in my experience, many recreational athletes don’t take their diet as seriously as they could. I have talked about this a lot on social media, but exercise needs fuel, for us humans that fuel is the Calories we get from food and beverages. If you take your sport or exercise performance even semi-seriously and you aren’t taking 24-hour energy balance (Calories in Calories out) into account you might be reducing your performance potential, not to mention harming your health. There isn't an evidence-based practitioner in the world who would say otherwise.
It seems like every day the newspapers print some rubbish about fitness or nutrition. The headline is more often than not scary and sensationalist. No surprises there then. I mean, the job of the press isn't to educate you (perhaps controversial nut unfortunately true) but to sell papers. Using click-bait headlines that evoke emotional responses from readers is the most tried and tested way of doing this.