She says the deficit in D2 could also encourage overeating by making people less sensitive to the pleasure of eating itself, needing greater quantities of food to feel the reward.1. needing greater quantities of food to feel the reward 是现在分词短语，作?making people less sensitive to the pleasure of eating itself 的“结果状语”。它们之间不是并列。若是并列需要 and 连接。2.?by making people less sensitive to the pleasure of eating itself 是 encourage overeating（导致暴饮暴食）的方式，而?needing greater quantities of food to feel the reward ?则是这种方式产生的结果。She says the deficit in D2 could also encourage overeating by making people less sensitive to the pleasure of eating itself, needing greater quantities of food to feel the reward.【怎么翻译】她说，D2 的不足还会使人们对吃本身的乐趣不那么敏感，（结果）需要更大量的食物来接受这种报应，从而导致暴饮暴食。