Green foods and juices have been around for a long time as health supplements, but these days some restaurants are serving up glasses of lawn-redolent wheat grass juice, or spirulina, with your lunch.
A sip of what is essentially ground-up meadow (same bright green color, same revivifying pastoral scent) has become a very hip power drink. Some even say a cup of chlorella beats coffee. To a coffee lover, that's quite a challenge.
So what are chlorella, spirulina, wheat grass and barley grass, and why are we ingesting them?