Leptin is a hormone that helps manage appetite levels. If you are feeling lethargic or if you want to lose a little bit of weight, you may require more leptin in your system. Leptin works by informing your brain about how much you have in your fat reserves.
For most cases of food poisoning, symptoms tend to come on within one to three days of eating the contaminated food. However, for some types of food poisoning, this 'incubation period' can be as long as 90 days.
Any vomiting resulting from food poisoning generally lasts for about a day, while any diarrhea may last for two or three days. In addition to the classic symptoms above, food poisoning and gastroenteritis can also bring about: 1,4. 1  Loss of appetite and weight loss. 2  Fever-high temperature and 'chills'.