It is interesting that the big ingredient involved is cafeine. At least one religious group (Mormons) ban it. Of course, cafeine in large amounts can be dangerous (which is probably true of virtually anything, even bread and water). But is adopting a quasi-religious objection to cafeine (a major ingredient in coffee, chocolate, tea and many soft drinks) raising a shailoh of avodah zara?
Environmental and health nuts are fine when they stick to science. But their enthusiasm tends to blend in into a mystical faith in their positions, and that raises shailohs.