Vitamins & Deficiency Diseases: The Most Asked Science Topic

If there's ONE science topic you should never skip, it's Vitamins and Deficiency Diseases. This single topic gives 2-3 GUARANTEED questions in every government exam — RRB, SSC, Police, all of them. The reason is simple: it's factual, it's fixed, and it never changes. Vitamin A causes Night Blindness whether the exam is in 2020 or 2030. Learn this table once, revise it a few times, and those 2-3 marks are yours for life. Let's go through every vitamin with its chemical name, deficiency disease, and food sources.

Fat-Soluble Vitamins: A, D, E, K

Vitamin A (Retinol): Deficiency causes Night Blindness (Nyctalopia) and Xerophthalmia (dry eyes that can lead to blindness). Sources: Carrot, Mango, Papaya, Sweet Potato, Milk, Liver. Mnemonic: "A for Aankh" (eyes). Vitamin D (Calciferol): Deficiency causes Rickets in children (soft bones, bow legs) and Osteomalacia in adults (weak bones). Sources: Sunlight (best source — your body makes it!), Fish oil, Egg yolk, Fortified milk. Mnemonic: "D for Dhoop" (sunlight). Trick question: "Which vitamin can the body produce itself?" Answer: Vitamin D (from sunlight).

Vitamin E (Tocopherol): Deficiency causes Infertility and muscular weakness. Sources: Nuts (almonds, peanuts), Vegetable oils (sunflower, safflower), Seeds, Green leafy vegetables. Mnemonic: "E for (f)Ertility." Vitamin K (Phylloquinone): Deficiency causes Blood clotting problems — wounds don't stop bleeding. Sources: Green leafy vegetables (spinach, broccoli, kale), Soybean oil. Mnemonic: "K for Klotting" (spell it with K to remember). Important: Fat-soluble vitamins (A, D, E, K) are stored in body fat and liver. You don't need them daily. Trick: Remember "ADEK" — all fat-soluble.

Water-Soluble Vitamins: B-Complex & C

Vitamin B1 (Thiamine): Deficiency causes Beriberi (weakness, nerve damage, heart problems). Sources: Whole grains, Nuts, Pork, Seeds. Mnemonic: "B1 = Beriberi (both start with B)." Vitamin B2 (Riboflavin): Deficiency causes Ariboflavinosis (cracked lips, sore throat, skin problems). Sources: Milk, Eggs, Almonds, Mushrooms. Vitamin B3 (Niacin): Deficiency causes Pellagra (the 3 Ds — Dermatitis, Diarrhea, Dementia). Sources: Meat, Peanuts, Mushrooms. Mnemonic: "B3 = Pellagra = 3 Ds." Vitamin B5 (Pantothenic Acid): Deficiency causes Paresthesia (burning feet syndrome). Sources: Meat, Avocado, Broccoli.

Vitamin B6 (Pyridoxine): Deficiency causes Anemia and skin disorders. Sources: Poultry, Fish, Potatoes, Bananas. Vitamin B7 (Biotin): Deficiency causes Dermatitis (skin inflammation) and hair loss. Sources: Eggs, Nuts, Whole grains. Vitamin B9 (Folic Acid): Deficiency causes Megaloblastic Anemia and Neural Tube Defects in newborns (birth defects). Critical for pregnant women. Sources: Green leafy vegetables, Beans, Citrus fruits. Vitamin B12 (Cobalamin): Deficiency causes Pernicious Anemia (a type of anemia where body can't make enough healthy red blood cells). Sources: Meat, Dairy, Eggs, Fish. Important: B12 is NOT found in plant foods — this is a frequently asked fact for vegetarian-related questions.

Vitamin C (Ascorbic Acid): Deficiency causes Scurvy (bleeding gums, weakness, joint pain). Sources: Citrus fruits (orange, lemon), Amla (Indian gooseberry — richest natural source of Vitamin C!), Guava, Tomato, Capsicum. Mnemonic: "C for sCurvy" or "C for Citrus." Historical fact examiners love: British sailors were called "Limeys" because they carried limes on ships to prevent scurvy. Water-soluble vitamins (B-complex and C) are NOT stored in the body — excess is flushed out through urine. You need them daily.

Mineral Deficiencies: Iron, Iodine, Calcium

These three mineral deficiencies are asked almost as often as vitamins. Iron Deficiency: Causes Anemia (low hemoglobin, fatigue, pale skin). Most common nutritional deficiency in India. Sources: Spinach, Jaggery (gur), Red meat, Beans. Iodine Deficiency: Causes Goiter (swollen thyroid gland in the neck). This is why iodized salt is mandatory in India. Sources: Iodized salt, Seafood, Dairy. Calcium Deficiency: Causes Osteoporosis (brittle bones, especially in elderly and women). Sources: Milk, Cheese, Yogurt, Green leafy vegetables. Mnemonic: "IGA" — Iron = Anemia, Iodine = Goiter, Calcium = Osteoporosis (weak bones, A for aged people).

Quick Mnemonic Summary & Exam Tips

Here's your cheat sheet for last-minute revision. Fat-soluble: ADEK. "A = Aankh (Night Blindness), D = Dhoop (Rickets), E = fErtility, K = Klotting." B-complex: "B1 = Beriberi, B2 = Ribo (lips), B3 = Pellagra (3 Ds), B9 = Folic (Fetus — birth defects), B12 = Pernicious (no plants)." "C = sCurvy (Citrus/amla)." Minerals: "Iron = Anemia, Iodine = Goiter, Calcium = Osteoporosis." Practice vitamin questions on the app daily for a week — after that, you'll answer these questions on autopilot in the exam.

This one topic can give you 2-3 marks in every single exam you take for the rest of your competitive exam journey. That's not an exaggeration — check any previous year paper and count the vitamin/disease questions. They're always there. You've just read the complete table. Now bookmark this article, revise it 3 times this week, and those marks are permanently locked in your memory. Vitamins chhote hain, par marks bade dete hain — kabhi mat chhodna!