Vitamin D Deficiency in Pakistan: Signs & What to Do

It sounds like it should be impossible. Pakistan gets some of the strongest sunshine on Earth — long, bright summers, and winters mild enough to sit outside in January. Yet study after study keeps reaching the same uncomfortable conclusion: we are a sun-drenched country running badly low on vitamin D.

A meta-analysis published in the Journal of Diabetology pooled data from Pakistani studies and found roughly 80% of people tested were vitamin D deficient. Another large review — 37 studies covering nearly 20,000 people — put the pooled figure at 78%, with children and teenagers at 84%. A separate South Asia-wide meta-analysis estimated 73% for Pakistan. Whichever number you take, it is not a fringe problem. It is the majority of us.

The good news is that deficiency is easy to detect and straightforward to correct — once you know what to look for.

What vitamin D actually does

Vitamin D is often called the sunshine vitamin, but its job description is bigger than most people realise. Its best-known role is helping the body absorb calcium and phosphorus — the minerals bones are built from. Without enough of it, that absorption stalls, and bones pay the price. Beyond bones, the vitamin D receptor is found in cells across many body systems, and research links adequate levels to normal muscle function and immune activity (NIH Office of Dietary Supplements; Cleveland Clinic).

In children, severe deficiency causes rickets — bowed legs and slowed growth. In adults, long-term severe deficiency can lead to osteomalacia, where bones become soft and painful, and it raises the risk of osteoporosis and fractures over time (Cleveland Clinic).

Signs your levels might be low

Here is the tricky part: deficiency usually arrives quietly. Most people feel nothing at first, and the symptoms that do show up are easy to blame on a busy schedule or a long week. According to the Cleveland Clinic, common signs include:

• Persistent fatigue — tiredness that doesn’t lift with rest
• Bone pain, especially in the back, or a general achiness
• Muscle weakness, aches, or cramps
• Getting sick often, with infections taking longer to clear
• Low mood or low energy that lingers

Other reported signs include hair loss and wounds that heal slowly. None of these is exclusive to vitamin D — fatigue, for example, has dozens of causes — which is exactly why guessing is a bad strategy. These are prompts to get checked, not a diagnosis.

Why it happens in Pakistan — despite all the sun

If sunlight makes vitamin D, how can a sunny country be this deficient? The answer is a handful of everyday realities that add up:

Indoor lives. Most of us spend the working day indoors — in offices, shops, and classrooms — and commute before or after the hours when UVB is strongest. Sunlight through office glass, car windows, or clothing doesn’t make vitamin D; only direct skin exposure does.

Clothing and sun avoidance. Research from Quetta found deficiency in 59% of female housewives studied, with short weekday sun exposure (under 15 minutes), keeping covered in the sun, and limited intake of eggs, milk, and fish among the associated factors (study summarised here). Modest dress and sunscreen are sensible habits, but they reduce the skin exposure the body needs for vitamin D synthesis.

Skin tone. Darker skin contains more melanin, which reduces UVB absorption — meaning people with darker skin need longer exposure to make the same amount of vitamin D.

Diet gaps. Very few foods naturally contain vitamin D. Fatty fish (salmon, mackerel, tuna), fish liver oils, egg yolks, and mushrooms are the main natural sources, and several countries fortify milk, juice, and cereals — but in Pakistan, fortified options are far less common on shelves, and fish like salmon is out of reach for most household budgets (NIH Office of Dietary Supplements).

City air. Smog and heavy air pollution — a fact of life in Lahore, Karachi, and other large cities in winter — can cut the UVB that reaches your skin.

Age, weight, and health conditions. Older adults make less vitamin D from sun, partly because skin becomes less efficient at it. Obesity is linked with lower blood levels, since vitamin D gets sequestered in fat tissue. People with kidney or liver disease, digestive disorders like celiac disease, or those who have had weight-loss surgery are also at higher risk (Cleveland Clinic).

How deficiency is actually diagnosed

Symptoms raise the question; a blood test answers it. The standard measure is the 25-hydroxyvitamin D (25[OH]D) test. The NIH defines deficiency as a level below 20 ng/mL (50 nmol/L), with 20–30 ng/mL considered insufficient and 30 ng/mL or above generally sufficient.

One useful nuance: the Endocrine Society’s 2024 guidelines found no benefit in routine testing for the general healthy population — but testing makes sense if you have symptoms, limited sun exposure, or risk factors. A quick conversation with your doctor is the right first step.

What to do about it

Get sensible sun. For most people in Pakistan, a few short outdoor sessions a week — midday, with arms, face, and legs exposed — is the most effective free source. There’s no need to burn; and this isn’t medical permission to skip sunscreen at the beach. It’s a balance, and fair-skinned or sun-sensitive people should be especially careful.

Eat what vitamin D sources you can. Egg yolks, fish (whatever is available and affordable locally), mushrooms, and any fortified milk, yogurt, or cereals you can find all help. Diet alone rarely fixes a deficiency, but it supports everything else.

Know the daily targets. The NIH’s recommended dietary allowance is 600 IU per day for ages 1 through 70, 800 IU after age 70, and 400 IU for infants. These are maintenance targets, not treatment doses.

Treat a real deficiency under medical guidance. If your blood test shows you’re deficient, the correction dose is a decision for your doctor — not a guess from a search result. High doses can have side effects, and the NIH sets a general upper intake limit of 4,000 IU per day for adults unless a doctor advises otherwise (NIH Office of Dietary Supplements). Don’t megadose on your own.

Don’t forget calcium. Vitamin D’s whole point, bone-wise, is helping your body use calcium — adequate calcium intake from diet is part of the same picture (NIH Office of Dietary Supplements).

Pay extra attention if you’re at higher risk. That includes older adults, pregnant and breastfeeding women, people who spend nearly all day indoors, and anyone with kidney, liver, or digestive conditions.

Quick answers to common questions

Can I fix deficiency with food alone?
Almost never on its own. Natural food sources are too limited to restore a real deficiency quickly; sun exposure and, when needed, doctor-guided supplementation do the heavy lifting.

How fast do levels come back up?
With consistent correction — sun, diet, and any supplement your doctor recommends — levels typically improve over weeks to a few months, depending on how low you started. A follow-up blood test tells the real story.

Can you take too much vitamin D?
Yes. It’s a fat-soluble vitamin, so excess accumulates in the body rather than flushing out. Actual toxicity is rare and typically only seen with very high doses — one published case report estimates the toxic dose at more than 100,000 IU per day taken for at least a month — but the exact threshold is unknown and varies between people. That’s why high-dose correction should always be medically supervised — your doctor will decide the right dose for you based on your blood test.

References

Marins TA, Galvão TF, Korkes F, Malerbi DA, Ganc AJ, Korn D, et al. Vitamin D intoxication: case report. Einstein (São Paulo). 2014;12(2):242–244. doi:10.1590/S1679-45082014RC2860. Free full text: https://pmc.ncbi.nlm.nih.gov/articles/PMC4891171/

Medical disclaimer: This article is for general information only and is not medical advice. Please consult a qualified doctor for diagnosis and treatment.