New research says that exposing to the smell of junk food for at least two minutes can actually help you make【小题1】(healthy) food choices.

The results of a series of experiments, including field【小题2】(study) at a supermarket and at a middle school cafeteria， show that extended exposure to junk food smell【小题3】(lead) to lower purchases of unhealthy foods【小题4】(compare) with healthy smell. The brain doesn't necessarily distinguish【小题5】a pleasurable smell and taste. That is【小题6】long exposure to junk food smell can be as satisfactory as actually having it in your mouth,【小题7】in turn decreases the desire for consumption of junk food.

However, it's not the same case with smell of healthy food. When the exposure to smell of healthy food【小题8】(examine), food choices were not【小题9】(profound) influenced. The reason for this is that healthy food is not connected with reward in our brain and therefore has little influence on【小题10】we desire.

Usually, stress is seen as being bad, but this is not always true. Eustress(积极压力)is the positive term for stress. It 【小题1】(relate) to well-being and positive attitudes. Eustress occurs when the gap between what one has and what one wants is 【小题2】(slight) pushed. Eustress creates a better environment for people, which 【小题3】(make) them perform better and cost less. Therefore, Eustress is necessary 【小题4】 achievement.

There is much debate nowadays as to 【小题1】 makes up a healthy diet. For example, scientists have insisted for years that a big enemy of health is fatty food. However, there is 【小题2】 (increase) evidence that the real driver of poor health is sugar. People who receive 25% of their daily calories or more through sugar are twice more likely to die from heart disease 【小题3】 those who don’t. Put more 【小题4】 (simple), we already know that sugar is a killer.