According to a recent study, it is possible to lose 5 kilos without a diet in a year with a trick that avoids other restrictions, but for which it is necessary to exercise, for example by going to the gym.

This is established by a research published in the  Journal of Science and Medicine in Sport , which reveals that what we eat before doing sports determines a greater or lesser energy expenditure.

If you are one of those who go for a run on an empty stomach or go to the gym without having a snack half an hour or an hour earlier, this study might make you think again.

The researchers divided a sample of women into 3 groups.

1. The first had a high-protein meal (i.e. 45 percent of the food was protein).
2. The second low in protein and with more carbohydrates.
3. And the third did not eat anything.After that they did an hour on the treadmill. The result is incredible: the people who ate the protein snack spent about 185 calories more than the other 2 groups.

If you always keep the same calorie ceiling including the snack, eating something protein before playing sports allows us to burn many more calories per session.

So at least 550 extra calories per week if we exercise 3 times a week.
At least 700 if we exercise 4 times.

With the result of losing 5 kg without dieting in a year without having done anything special beyond the usual routine.

What can this protein snack be?
Here are some 100-calorie tips.

• A hard-boiled egg, a slice of bresaola and a slice of tomato on a brown rice cake.
• A fat-free Fage Greek yogurt with a hint of honey.
• 100 grams of cottage cheese and a wedge of apple.
• A protein shake with a handful of blueberries, 100ml skim milk, 125ml low-fat vanilla yogurt.
  
  Or more simply a protein bar!