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Small intestine is major area of absorption of nutrients. Approximately 80% of absorption takes place here. Glucose, fructose, fatty acids, amino acids (Glycine etc.) are absorbed through mucosa into blood and lymph by active absorption.

1. Physiological value of carbohydrates is 4.0 kcal/g, proteins 4.0 kcal/g and of fats is 9.0 kcal/g.
2. 5 g raw sugar will yield 5 × 4.0 = 20.0 kcal.
3. 4 g albumin (protein) will yield 4 × 4.0 = 16.0 kcal.
4. 10 + 2 g of fat will yield 12 × 9.0 = 108.0 kcal. Total yield = 144 kcal.

Correct answer: 10 + 2 g of fat will yield 12 × 9.0 = 108.0 kcal. Total yield = 144 kcal.

Solution

The correct choice applies the standard physiological energy values: carbohydrates and proteins provide 4 kcal/g, while fats provide 9 kcal/g. For 10 g plus 2 g of fat, the total is 12 g, so the energy from fat alone is 12 × 9 = 108 kcal; adding the other listed components gives a total of 144 kcal.

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