There have been plenty of studies on the link between stress and its effects on overall health and wellness, so you should be able to find plenty of solid information that supports the effects of stress on a person's health. You may certainly come up with an argumentative thesis statement that claims the link between stress and poorer health is false or exaggerated; however, I think that you will find that argument difficult to support.
My recommendation for the initial thesis is to stay somewhat broad. For example, a broad thesis may read "Although stress is a normal body response to various situations, constant stress can have detrimental impacts on a person's overall health and wellness."
This particular thesis gives you the opportunity to explore what stress is and explain that stress is a normal biological response to certain environmental conditions. Constant and pervading stress is the problem. Your paper should explore that difference.
The thesis provided also stays broad in that...
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