PET scans of areas of their brains activated by thirst showed reactions -- particularly in the cingulate cortex. In the elderly, drinking a much smaller volume of water is needed to cause that area of brain activation to subside, said Egan, who is an expert on neuro-imaging.
What is Nutrient Density? It is a measure of the nutrients provided per calorie of food, or the ratio of nutrients to calories (energy). Foods that supply generous amounts of one or more nutrients compared to the number of calories they supply are called nutrient dense.
The denominator is the energy density of the food (kilocalories per 100 g): nutrient density score (expressed per 100 kcal) = (nutrient adequacy score/energy density) x 100. The score represents the mean of percent DVs per 100 kcal of food.