Calcium is a common deficiency and leads to Osteoporosis. But it is largely unavailable unless or until combined with fat. “Skim” Milk is useless in that regard.
And if you are going to buy milk, why not get more for your $ by choosing whole milk? Add water to make skim. As you likely know, may years ago milk was delivered, and without being homogenized then the cream was at the top, and our parents would take that cream for their coffee (which was believed to stunt growth) and us 5 kids (b4 contraception and its costs became the norm) go the skim. Literally skimmed.
People are generally not deficient in calcium, they are deficient in magnesium which is required for calcium absorption. Supplementing with calcium can be quite dangerous especially when you’re low and magnesium. Get on a good glycinate malate or taurate magnesium supplement. Avoid oxide at all costs
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Knowing this, it is incredible that Senior Centers across the nation provide only fat-free or 1% milk for elders in their meal menus, apparently thinking that “fat is bad” in formulating senior meals.