You would think that heavy people would have a heightened smell sensitivity compared with those who are not heavy. Also, you would think this might be the reason why fat people are likely to put on weight more quickly (than those who are not fat). However, a recent work has revealed that it is not true. Regardless of how heavy they are, the work shows that hungry people have a tendency to have a better smell sensitivity to food*, even before eating a meal. Interestingly, after eating meals, heavy people are more likely to prefer food scenes than non-food scenes. Researchers believe this might drive the heavy people not to put down their forks and knifes, and tuck food in.
*I didn't understand what you meant so this sentence's meaning might be incorrect
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