Everything comes with some pros and cons. The same holds true in the case of diet pills as well. Even though they do help in reducing weight, they also can be very harmful in the long run. Many diet pills are addictive and habit forming which results in it being abused. These diet pills also lead to metabolism disruption. This is not a very healthy way of getting rid of the excessive weight as it’s hard to keep the weight away for a very long time. As soon as you get off the diet pills, the fat finds its way back.