Cacao is good for you in moderation and has antioxidant properties if it's not processed with alkali. Most chocolate available, including dark chocolate, is processed with alkali so it doesn't have the same antioxidant benefits. Also, the vast majority of chocolate contains soy which some argue is estrogenic meaning it converts your free testosterone into the 'female hormone' estrogen through a process known as aromatase.
Estrogen isn't altogether bad as it supposedly protects your heart and cardiovascular system. Hong Kong and Japan rank #1 and 2 for average lifespan and they consume a lot of soy. However, their soy is of a much higher quality than in the US where GMO soybean from Monsanto is predominantly found. Monsanto soybeans are high in glyphosate which is an ingredient in round up weed killer, an herbicide they invented. They've been spraying crops with their herbicide annually since 1974. The levels of glyphosate found in food today is over 100× higher than it was 30 years ago.
Unfortunately, Monsanto is a massive company and they are now selling their garbage to the rest of the world including Japan and other parts of Asia. So, arguably, the problem with soy in chocolate as well as in many other foods is that it's not just soy but the herbicides they spray it with in the US (which is now making its way to other parts of the world). Interestingly, Monsanto is owned by Bayer who is connected to Pfizer.
So personally, I would only consume dark chocolate that is soy free and that hasn't been processed with alkali. You can see this information in the ingredients list on the back.
Occasionally, you should take breaks from both coffee, tea, and chocolate. Over a prolonged period, they are stressful to the liver but might be beneficial for liver health in moderation.
