Keto tone avis For starters just pick one and when that becomes a habit, try the next weight loss tip that strikes your fancy. The most important weight loss idea has to do with the Law of Thermodynamics. This law means that in order to lose weight, you need to spend more energy than you take in. In order to gain weight you need to take more energy in than you put out. So, losing weight is simple; eat less food while moving more often! The weight loss tips below are just ways to take advantage and make more efficient use of this unavoidable law of nature.