Barbara wants to convince her audience of college students that they should all become vegetarians. she tries to scare her listeners by presenting several serious health dangers to eating meat. this high fear appeal is not likely to work unless

proven fact

Explanation: Unless it is an proven fact that meat can cause health effects like Diabetes and Heart Disease. Will them people quit it even if they are told to go off of it.

exercising at a moderate intensity, and slowly increasing the duration.