Why is a high fat diet considered to be low in nutrient density?
Answer: Fat has more calories per gram (9), compared to proteins and carbohydrates (4), which means that you get less food if your diet is high fat compared to if it was low fat with the same amount of calories. A low fat, nutrient dense diet is healthier because you fill up while eating fewer calories and you also get more nutrients.
water-soluble vs. fat-soluble vitamins
Water-soluble vitamins can be dissolved in water, which enables them to go into your bloodstream. Fat-soluble vitamins are stored in your fat.