Feeling under the weather? Here are some of the first signs of mononucleosis (mono for short), which is caused by the Epstein-Barr virus.

Saliva is a necessary part of the digestive process. It begins when enzymes are produced to initiate the breakdown of foods during chewing. The continual production of saliva keeps the mouth moist.

Epstein-Barr Virus (EBV) is a common virus: According to Dr. John Sullivan, writing in the medical database UpToDate, it is estimated that 90 to 95 percent of adults have evidence of being infected by the virus at some time. It commonly causes mononucleosis--infamously known as the "kissing disease"

Mononucleosis is an illness that results from a viral infection. The illness can last several weeks and leave you feeling weak and fatigued afterward. You may not feel completely recovered for a month or more after the illness goes away.

The Epstein-Barr virus is very common and affects nearly all individuals in the United States at one point or another during their lifetime. It can be either acute or chronic, and although there isn’t a cure, lifestyle changes — including your diet — can help relieve symptoms and promote healing.

Epstein-Barr, or EBV, is one of the most common human viruses, states the National Center for Infectious Diseases. Ninety-five percent of Americans in their late 30s will contact EBV. The majority of the time, your symptoms are nonexistent or minor and usually confused with some other mild illness.

The first symptoms of mononucleosis may appear as stomach problems, such as nausea, vomiting and diarrhea, which can make eating unappealing. Opt for small, frequent meals throughout the day to stave off digestive woes and keep your energy levels up.