Which nutrient is most likely to be deficient among the general population?

The nutrient most likely to be deficient among the general population is typically vitamin D. This is primarily due to a combination of factors including limited sun exposure, particularly in regions with long winters or for individuals who spend the majority of their time indoors. Vitamin D is essential for bone health, immune function, and overall well-being, and the body synthesizes it when the skin is exposed to sunlight. Many people also do not consume enough dietary sources of vitamin D, such as fatty fish, fortified foods, and egg yolks.

While calcium, zinc, and vitamin A are important nutrients as well, widespread deficiencies of these nutrients are less common compared to vitamin D. Calcium deficiency can occur, particularly among individuals who do not consume dairy products, but many people do manage to meet their calcium requirements through alternative sources. Zinc is generally obtained through a varied diet that includes meat, seafood, dairy products, nuts, and whole grains, making significant deficiencies less prevalent. Vitamin A is often acquired through dietary sources like carrots, sweet potatoes, and dark leafy greens. Therefore, while all these nutrients are important, vitamin D remains the most commonly under-consumed nutrient across different populations.