Ingesting foods high in salt causes thirst. To quench it, people will tend to increase their consumption of water or other drinks. Although drinking water does not increase calorie consumption, drinking soft drinks will have a negative impact on your weight.
In addition, high salt consumption causes your body to retain water (1g of sodium in your body retains 100ml of water). This makes weight loss more difficult (it is the low salt consumption that causes water to be expelled). In this respect, it is interesting to note that many diets promising rapid weight loss are based on foods with little or no salt content.