Question

The constituents of food Which serve as thermal insulators are
a) carbohydrates b) proteinsc) fats d) roughage

Answer 1

The constituents of food which serve as thermal insulators are proteins.


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Answer 2

b) Proteins.

The constituents of food Which serve as thermal insulators are proteins.

Best material for thermal insulation is the perfect vacuum.  

It doesn't seem like a feasible option for you as a good alternative is a commercially available insulator such as Aerogel.  

Styrofoam works fairly well too and the lower thermal conductivity of a substance are better.