The kilos accumulated during winter are concerning us… It’s time to eliminate Christmas, Candlemas, Easter diners as fast as possible. We now have to take advantage of the first months to lose weight progressively, to reach our fitness weight without exceeding 1kg per week. A fast weight loss can have dangerous consequences on health, and can decrease performance. The inferior limit of a diet is 2000 calories. A reduction inferior to 2000 calories must be controlled by a doctor. Diet programs reducing the caloric intake can be dangerous because they result in water loss, electrolytes, minerals, glycogen and proteins loss with a quite low fat loss. Slimming strategies are based on a negative energetic balance. It is now fully demonstrated that combining diet and increase of the physical activity gives better results in the long term rather than focusing only on one of the points of this combination.