Which food substance is absorbed, without digestion-

Options

A. Carbohydrates
B. Proteins in stomach
C. Vitamins
D. Fats

Answer

**Step-by-Step Solution:**

1. **Understanding Food Substances**: Food substances can be categorized into carbohydrates, proteins, fats, and vitamins. Each of these undergoes different processes in the digestive system.

2. **Carbohydrates**: Carbohydrates, such as starch, need to be digested. They are broken down into smaller units like maltose and then into monosaccharides (simple sugars) before absorption.

3. **Proteins**: Proteins also require digestion. They are broken down into smaller peptides and eventually into amino acids by enzymes like pepsin in the stomach. Only after this breakdown can they be absorbed.

4. **Fats**: Fats undergo emulsification and are broken down into fatty acids and glycerol. This process is essential for their absorption, indicating that fats are also digested before absorption.

5. **Vitamins**: Unlike carbohydrates, proteins, and fats, vitamins do not require digestion. They can be absorbed directly into the bloodstream in their intact form. This is particularly true for water-soluble vitamins like B vitamins and fat-soluble vitamins like vitamin D.

6. **Conclusion**: Based on the analysis, the food substance that is absorbed without digestion is vitamins.

**Final Answer**: The food substance absorbed without digestion is **vitamins**.

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