Weight loss is a great achievement; however, the thought of loose skin after the weight loss keeps many people from feeling comfortable with their success. In fact, loose skin varies depending on a person's age, genetics, and the amount of weight lost. That being said, you can do a few things that will make your skin less stretched and more elastic again by collagen and elastin maintenance, as they are the two major proteins found in the skin that give it its structure: collagen (for firmness) and elastin (for flexibility).
It can be debated that this is the single most significant method. When weight is lost rapidly (more than 1–2 pounds per week), the skin's collagen and elastin fibers do not get the time they require to react, and therefore, they cannot retract from the decreasing body.
The Goal: The main goal should be slow and sustainable weight loss. Skin tightening goes together with fat loss at a gradual pace, so the skin is given the opportunity to regain its original elasticity. That is also the reason why crash diets and extreme calorie restrictions should not be practiced.
While cardio is still good for burning calories, it is strength training that really makes a difference to the skin. What you do is increase the muscle mass under the skin thereby giving the skin volume and the structure it requires.
The Benefit: Muscles will be the ones that fill the skeleton thus making the skin look tighter and firmer. You should do weight training, resistance band exercising, or bodyweight workouts (such as squats or planks) at a minimum of three times per week and concentrate on the areas where you want your skin to be tighter.
What you eat directly affects the condition of your collagen and elastin. The right nutrients give your skin the work materials it needs as well as the protection it needs to be able to repair itself.
External factors may speed up the process of collagen and elastin becoming worn out in your skin:
In conclusion, slow and steady fat loss, muscle building by means of resistance training, and proper skin care with protein and essential vitamins will definitely reduce the risk of loose skin that is often the result of weight loss. However, age and genetics still have some influence.