If people who are overweight due to chronic virus infection are treated with an effective antiviral, would their body weight decline or is the gain more likely to be permanent?

In those for whom the virus is the overwhelming driving force for weight gain, there will be a reversion to normal body weight with elimination of the virus. There are many for whom the viral presence is an aggravating factor on top of a karmic initiation of weight gain because of past trauma, usually in other lifetimes, such as dying of hunger. For those individuals where a chronic virus is simply making things worse, there may be some improvement seen from taking an antiviral regimen but it will not be a total answer for obesity in such individuals.