Final answer:
Vitamin B1 (thiamin) assists with muscle tone, digestion, and appetite, encompassing option d) All of the above for the question posed. Phosphorous, not thiamin or vitamins B and C, is stored in the body.
Step-by-step explanation:
Vitamin B1, also known as thiamin, plays a crucial role in the body's metabolism and has several physiological functions and biochemical roles.
One of these roles includes the utilization of carbohydrates to provide energy for the body. Thiamin is also important for maintaining good appetite and normal brain metabolism.
So, when asked what thiamin helps with, option d) All of the above is correct, as it contributes to muscle tone through its role in energy production, digestion through carbohydrate metabolism, and appetite by supporting normal brain function.
Regarding which substances are stored in the body, phosphorous is stored extensively in bones and some soft tissues.
Vitamins like thiamin are not stored and are excreted if taken in excess, which makes regular dietary intake essential. Water-soluble vitamins such as B and C are not stored in large quantities and need to be consumed regularly, while fat-soluble vitamins like A, D, E, and K can be stored in fatty tissues.