The studies are mixed because there is no one-size-fits-all solution to these problems, and a simple remedy that works for one person may not work for another.

The studies are mixed because there is no one-size-fits-all solution to these problems, and a simple remedy that works for one person may not work for another. Antidepressants are sort of a one-size-fits-all solution because they tackle the problem, not the cause of the problem. Medical doctors will usually jump right to a pharmaceutical solution to any problem, even though a little experimentation with simpler remedies doesn't hurt. For example, I was prescribed a $30k/yr drug with lifetime dependence for a problem that I managed to solve with a simple change in diet. Liability and economic incentives will almost always lead doctors to prescribing the most expensive solution to an issue, so it's unfortunately up to the patient to figure out if there's an alternative solution to their problem.