Add a tea spoon – or a bit more- of vinegar to thicken a sauce that has not come very well. Prepare mayonnaise with vinegar, instead of lemon: you can keep it in the fridge for a few days. Add a few drops of vinegar to whip the egg whites more easily. To prevent the egg shells from breaking, add one or two table spoons of vinegar when boiling eggs. Vinegar has less calories than lemon: 22 calories per 100 g vs. 29 calories of lemons. Moreover, the body can rapidly and completely get rid of vinegar; the same is not true for lemon, because the citric acid is only partially eliminated. Vinegar is also recommended for strict diets: just three calories per portion of salad. Thanks to the vitamins, mineral salts, enzymes and amino acids it contains, vinegar improves metabolism by producing digestive enzymes and facilitating the absorption of nutrients.