Fat burner vs. sugar burner, so which is better?
In a perfect world, both.
Guest breaks down the numbers, saying: “If I’m window shopping or going for an easy walk, about 40 per cent of my energy comes from fat. If I break into a jog, about 30 per cent comes from fat. If I start running at a good pace, you use about 98 per cent carbohydrates and two per cent fat.”
She reiterates the fact that while you do use fat for some exercises (though they are leisurely), “there isn’t any workout where you can burn 100 per cent fat; your ability to burn fat is about zero to 40 per cent at most.”