# Getting Vitamin D From Food: A Dietitian's Guide
Vitamin D deficiency affects roughly one billion people worldwide, yet many overlook dietary sources of this essential nutrient. Registered dietitians recommend adding specific foods to combat low levels without relying solely on supplements or sun exposure.
Fatty fish lead the list as nature's richest vitamin D sources. Salmon, mackerel, and sardines deliver 570 to 945 IU per three-ounce serving, according to the National Institutes of Health. Egg yolks contain roughly 40 IU per egg, while mushrooms exposed to sunlight can produce significant amounts through a process similar to human skin synthesis.
Fortified foods offer another practical route. Milk contains about 100 IU per cup, while fortified orange juice and plant-based dairy alternatives like almond and soy milk typically provide 100 to 150 IU per serving. Fortified cereals range from 40 to 1,000 IU per portion, depending on the brand.
Less obvious sources include canned tuna, oysters, beef liver, and cheese. A three-ounce can of tuna in oil provides around 200 IU. Oysters deliver 320 IU per three-ounce serving. Swiss cheese offers 44 IU per ounce.
The recommended daily intake varies by age. Adults under 50 need 600 IU daily, while those 50 to 70 require 600 to 800 IU, and adults over 70 need 800 IU. Certain groups including people with darker skin tones, those with limited sun exposure, and individuals with digestive disorders benefit from intentional dietary planning.
Dietitians stress that food alone often cannot meet vitamin D needs,