Yes, because these grains have destroyed a lot of nutrients in the process of deep processing, and the rest is a pile of sugar, fat, protein, carbohydrates and so on. These things are over-supplemented by the rice we usually eat, and the more we eat, the fatter we get. However, the taste of golden flavor is really good, and there is nothing wrong with drinking it.
You don't have to drink at that age, but it depends on your fitness.