There’s almost some truth to it. Certain foods, like salts and carbs, in certain situations, like low salt/carb diets, can have a ripple effect. 100g of carbs, or a few grams of salt, can cause your body to retain water. The effect being that you gained several pounds from eating just a few (hundred) grams of certain foods.
However, for your body to retain that water, you must also consume said water.
There’s almost some truth to it. Certain foods, like salts and carbs, in certain situations, like low salt/carb diets, can have a ripple effect. 100g of carbs, or a few grams of salt, can cause your body to retain water. The effect being that you gained several pounds from eating just a few (hundred) grams of certain foods.
However, for your body to retain that water, you must also consume said water.