Which of the following is more bioavailable after processing tomatoes?

Question

BlackTom AI · Accepted Answer

Lycopene becomes more bioavailable after processing tomatoes because heat and mechanical disruption liberate this fat‑soluble carotenoid from the plant matrix and convert it into forms that the body absorbs more easily.

Relevant knowledge points and concepts:
- Bioavailability: fraction of an ingested nutrient that is absorbed and available for use. For fat‑soluble compounds, incorporation into micelles and presence of dietary fat are critical.
- Lycopene: a carotenoid found in tomato chromoplasts, predominantly as the all‑trans isomer in raw tomatoes; fat‑soluble and stored within cell membranes and plastids.
- Processing effects: cooking, pureeing, and adding oil disrupt cell walls/plastids, release carotenoids, and promote trans→cis isomerization; cis isomers are more soluble in mixed micelles and thus better absorbed.

Step‑by‑step reasoning:
1. Raw tomatoes contain lycopene trapped in chromoplasts and bound within membranes; intact structure limits release during digestion.
2. Thermal processing (cooking, heating) and mechanical breakdown (pureeing) rupture cell walls and plastid membranes, freeing lycopene into the food matrix.
3. Heat induces isomerization of lycopene from the all‑trans form to cis‑isomers. Cis‑lycopene has greater solubility in lipid micelles formed in the gut, improving uptake by enterocytes.
4. Because lycopene is fat‑soluble, co‑consumption with oil (common in processed tomato products) further enhances micelle formation and absorption.
5. Therefore, processed tomato products (sauces, pastes) typically deliver more absorbable lycopene than raw tomatoes.

Why the correct answer is correct:
Lycopene’s chemical nature and the known effects of cooking (release from matrix, isomerization) directly increase its bioavailability after processing.

Why the other options are incorrect:
- Tannins: plant polyphenols that may bind proteins/nutrients; processing can reduce their activity but does not make them “more bioavailable” in the same way carotenoids become more absorbable.
- Lectins: heat‑labile proteins often inactivated by cooking; processing typically reduces their biological activity rather than increasing their bioavailability.
- Phytates: antinutrients that chelate minerals; processing/fermentation can lower phytate levels, but they are not rendered more bioavailable by tomato processing.

Conclusion: The correct answer is lycopene, which matches the provided answer.

Which of the following is more bioavailable after processing tomatoes?单项选择题

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