Some employers operate a three-shift system. This means that in 3 weeks, a worker will have to work, for example, from 6 am to 2 pm in the first week, from 2 pm to 10 pm in the second week, and from 10 pm to 6 pm in the third week. This makes it very difficult for workers to have a routine of eating and drinking. People working a three-shift system report a severe decline in their appetite, especially during the night-shift when they would normally be asleep. Therefore, anyone working shifts like this will therefore lose weight.