Which is not responsible for nutrien loss?

Question

BlackTom AI · Accepted Answer

Heat, water and time are the main drivers of nutrient loss during food preparation: high temperatures break down heat-sensitive vitamins, water leaches out water-soluble vitamins and minerals, and prolonged cooking increases both of these effects.

1) Relevant knowledge points and concepts
- Heat sensitivity: Vitamins such as vitamin C and some B vitamins are thermolabile and decompose at elevated temperatures.  
- Leaching into cooking liquid: Water‑soluble nutrients (vitamin C, B vitamins, some minerals) move from the food into the cooking liquid; using a lot of liquid increases this loss.  
- Cooking duration: The longer food is exposed to heat or water, the greater the cumulative nutrient degradation and leaching.  
- Oxidation: Oxygen can oxidize certain nutrients (e.g., cut fruits browning, slow degradation of vitamins during storage), but it is not the principal cause of nutrient loss during typical cooking methods compared with heat, water volume, and time.

2) Step‑by‑step reasoning
- Compare option b (high temperature): High heat chemically degrades heat‑sensitive nutrients. This is a direct and well‑documented cause of nutrient loss. So b is responsible.  
- Compare option c (using a lot of liquid): More cooking liquid increases the amount of soluble nutrients that dissolve out; unless the liquid is consumed (e.g., soup), those nutrients are lost. So c is responsible.  
- Compare option d (long cooking): Increased time increases exposure to heat and water, compounding losses. So d is responsible.  
- Consider option a (oxygen): While oxygen can cause oxidation in storage or when produce is exposed to air, during cooking the dominant factors are temperature, water and time. Oxygen is not a primary cause of the nutrient losses described in the other options and is therefore the exception here.

3) Calculations: None required.

4) Why the correct answer is correct
Oxygen is the least responsible among the choices for nutrient loss during cooking; heat, excess water and long cooking time are the main contributors.

5) Why other options are incorrect
- b: High temperature — causes direct thermal breakdown of nutrients (incorrect as “not responsible”).  
- c: Using a lot of liquid — causes leaching of water‑soluble nutrients into the cooking medium.  
- d: Long cooking — increases cumulative degradation and leaching.

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

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