Final answer:
Thiamine, also known as vitamin B1, can be found in foods such as rice bran, nuts, eggs, fish, and meat. It is necessary for carbohydrate utilization, appetite maintenance, and normal brain metabolism.
Step-by-step explanation:
The richest sources of vitamin B1, also known as thiamine, include rice bran, wheat bran, whole grains, nuts, germinating seeds, pulses, beans, lentils, yeast, liver, eggs, fish, meat, and milk. Other good sources of thiamine include cereals, potatoes, and vegetables in smaller amounts.
Thiamine is necessary for the utilization of carbohydrates in the body, maintenance of good appetite, and normal brain metabolism. It is not stored in the body and should be consumed daily in the diet.
The daily requirement of thiamine depends on the calorie requirement and carbohydrate intake, typically ranging from 1.5 to 2.0 mg per day for adult males and 1.0 to 1.2 mg per day for adult females.