It is still not black and white, even if there is a contributing virus. What if, for example, the virus increases the chance to become obese by 0.25%? Or 0.025%

It is still not black and white, even if there is a contributing virus. What if, for example, the virus increases the chance to become obese by 0.25%? Or 0.025%? How serious should the counter actions be in this case, how much should be spent on searching for cure, compared, for example, with educating people on aspects of proper nutrition and physical exercise?