The Minerals Your Body Can't Afford to Ignore
I've been practicing as a Registered Dietitian for over a decade, and if there's one thing that still surprises me, it's how little attention minerals get. Everyone's chasing the latest supplement trend — peptides, adaptogens, whatever's going viral this week — while quietly running low on the foundational nutrients that keep every cell in your body functioning.
Let's fix that.
First, a few things minerals do that nothing else can
Unlike vitamins, minerals are virtually indestructible. You can cook them, process them, heat them — they don't budge. That's the good news. The bad news is that most people are still not getting enough of them, partly because the WHO's recommended levels were built around a low-fat diet model that I've never subscribed to. Minerals are also among the body's most powerful antioxidants — meaning they're actively fighting the free radical damage that accelerates aging, disease, and cellular breakdown every single day.
Now let's get specific.
Calcium: the bone mineral everyone thinks they're getting enough of
Calcium is the main structural component of bone. Simple enough. But here's what most people miss: absorption is surprisingly low — and a whole host of everyday factors make it worse.
Vitamin D dramatically improves calcium absorption, which is why I always address both together. Dietary fiber, on the other hand, can inhibit it. And while everyone loves to blame caffeine, its impact is actually minimal — so you can keep your morning coffee. Medications are a bigger concern and worth reviewing with your doctor.
For older adults, the target is 1,200 mg per day. A glass of milk gives you around 300 mg. The math tells the story: most older adults eating around 1,500 calories a day simply cannot hit that target from food alone. A supplement isn't optional — it's necessary. Ignore this and you're looking at osteoporosis down the road. Overdo it without guidance and you're risking kidney stones.
One more thing: if you're lactose intolerant, you're missing the lactase enzyme needed to digest dairy. You can either buy the enzyme directly — it's widely available — or switch to Almond milk, which naturally contains no lactose.
Phosphorus: the mineral you're probably not deficient in
Phosphorus works alongside calcium in a compound called hydroxyapatite — the mineral matrix that gives bone its strength. It also plays a critical role in phospholipids, energy transfer, enzyme activity, and keeping your body's acid-base balance in check.
The good news here is that phosphorus is absorbed at a much higher rate than calcium — between 50 and 70 percent — and it's widely distributed across the food supply. Deficiency is genuinely rare, and when I do see it, it's almost exclusively in patients who are severely malnourished. Aim for 700 mg per day and eat a reasonably varied diet and you'll almost certainly be fine.
Magnesium: quietly running hundreds of reactions in your body
This is one I flag constantly in my practice, because magnesium deficiency is far more common than most realize — yet it rarely shows up on a standard blood panel until things are already quite depleted.
Magnesium lives largely in the bone and acts as a cofactor for hundreds of enzyme reactions. It's essential for DNA and RNA synthesis. And unlike some nutrients, its absorption scales proportionally with intake — meaning if you're consistently low, your body isn't compensating the way you might hope.
Men need 420 mg per day; women need 320 mg. Average intake hovers around 300 mg. That gap matters. Load your plate with vegetables, fruits, and whole grains — these are your best dietary sources — and consider a supplement if your diet is inconsistent.
Sodium and chloride: a nuanced conversation
I know. Everyone tells you sodium is the enemy. The reality is more complicated than that.
Sodium is the major extracellular cation — it regulates fluid volume, nutrient transport, and water balance. Adults between 51 and 70 need around 1,300 mg per day; over 70, that drops to 1,200 mg. The issue isn't sodium itself — it's that some people are salt-sensitive, meaning their blood pressure responds more dramatically to dietary sodium than others. Know which camp you're in before you make sweeping changes.
Chloride, sodium's partner, supports digestion and helps maintain extracellular volume. Adults 51 to 70 need around 2 grams per day. Both come primarily from salty foods — which is exactly why blanket low-sodium advice without individual context frustrates me.
Potassium: pay attention if you're on diuretics
One I flag for patients on blood pressure medications especially: diuretics deplete potassium. If that's you, supplementation isn't optional — it's a clinical necessity. Talk to your doctor.
Trace Minerals: Small Amounts, Serious Consequences
Don't let the name fool you. Iron, zinc, copper, chromium, and selenium are needed in tiny amounts — but deficiencies in any of them can produce profound effects, including forms of anemia that are often overlooked because doctors aren't always looking at the full picture.
Iron
Here's something worth knowing: the body is smart about iron. It recycles it aggressively, which is one reason outright deficiency takes time to develop. Adults over 50 need 8 mg per day, and typical intake sits around 15 mg — so most people are fine. Your best sources are animal products, fortified cereals, and vegetables. Deficiency progresses through three stages before it becomes full-blown anemia, which is exactly why catching it early through bloodwork matters.
Zinc
Zinc is one I take seriously in every patient over 50. It acts as a catalyst for over 100 enzymes, supports immune function, enables smell and taste, drives growth and gene expression, and maintains skin integrity. That's a remarkable list for a mineral most people never think about.
Absorption varies significantly by source. Animal products deliver zinc well. Phytic acid in vegetables reduces absorption — something vegetarians and vegans need to account for. Men over 50 need 11 mg per day. Seafood is an excellent source, though quality matters — where it was sourced makes a real difference.
One thing that directly sabotages zinc status? Alcohol. If you drink regularly, your zinc levels deserve a closer look. Deficiency shows up in the skin first — as dermatitis — but the immune and sensory effects often precede any visible symptoms.
The bottom line is this: no supplement trend will compensate for a body that's quietly running low on its foundational minerals. Get the basics right first. Everything else is secondary.
