Insufficient intake of vitamin A-rich foods such as carrots, liver, and dairy products.

Poor absorption of vitamin A in the body.

Night blindness.

Dryness and inflammation of the eyes.

Increased susceptibility to infections.

Impaired growth and development in children.

Consuming a diet rich in vitamin A.

Vitamin A supplementation.

Inadequate consumption of foods containing B vitamins, including whole grains, meat, eggs, and dairy products.

Alcoholism, which impairs B vitamin absorption and utilization.

Certain medical conditions that affect B vitamin absorption.

Fatigue and weakness.

Irritability and depression.

Skin disorders.

Nerve damage.

Anemia.

Eating a balanced diet with sufficient B vitamin intake.

Taking B vitamin supplements.

Insufficient intake of fruits and vegetables which are rich sources of vitamin C.

Smoking, as it depletes vitamin C.

Medical conditions that impair vitamin C absorption.

Fatigue and weakness.

Bleeding gums.

Slow wound healing.

Joint pain.

Scurvy (severe deficiency).

Consuming a diet abundant in fruits and vegetables.

Taking vitamin C supplements.

Inadequate sun exposure, as sunlight triggers vitamin D synthesis in the body.

Limited intake of vitamin D-rich foods like fatty fish, fortified dairy products, and egg yolks.

Conditions that affect vitamin D absorption.

Bone pain and weakness.

Muscle weakness.

Increased risk of fractures.

Impaired immune function.

Spending time in the sun.

Consuming foods high in vitamin D.

Taking vitamin D supplements.

Inadequate intake of nuts, seeds, and vegetable oils, which are rich sources of vitamin E.

Malabsorption disorders that affect vitamin E absorption.

Muscle weakness.

Vision problems.

Impaired immune function.

Nerve damage.

Including vitamin E-rich foods in the diet.

Taking vitamin E supplements.

Limited intake of leafy green vegetables, liver, and fermented foods, which are sources of vitamin K.

Conditions that impair vitamin K absorption.

Prolonged use of certain medications that interfere with vitamin K metabolism.

Increased bleeding and bruising.

Hemorrhaging.

Delayed blood clotting.

Consuming vitamin K-rich foods.

Taking vitamin K supplements when necessary.