what are substances that need to be digested before absorption
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The food contains three macronutrients that require digestion before they can be absorbed: fats, carbohydrates, and proteins. Through the process of digestion, these macronutrients are broken down into molecules that can traverse the intestinal epithelium and enter the bloodstream for use in the body.
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Along the way, food is broken down into tiny molecules so that the body can absorb nutrients it needs:
- Protein must be broken down into amino acids.
- Starches break down into simple sugars.
- Fats break down into into fatty acids and glycerol.
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