Yes, you will know the people who eat yeast by their rosy complexions and giant bows they wear. After the demise of the quack medical tonics we had to start promoting something else that would be a panacea of health and vitality, why not yeast? I see these ads pop up with some regularity so there must have been a popular movement for consuming yeast, something akin to the cayenne pepper movement of the 1850's I shouldn't wonder. As for the yeast it's just normal bread yeast or in this case compressed yeast cakes as instant rise type yeasts we use today weren't available.
Now I don't know the efficacy of eating yeast and what it does for the body. But my research indicates that eating bread yeast cakes was eventually found to be detrimental to health as it can take root in your intestines and cause problems. Subsequently it has been replaced with brewers yeast or nutritional yeast. The nutritional yeast is quite tasty with a vague cheesy flavor. I had some on my popcorn when we went to see Oz the Great and Powerful at the Sunray Cinema.
Anyhow, nutritional yeast is a great source of Protein and B vitamins so it doesn't hurt to eat it, but I think I prefer my yeast as a part of my bread, thank you.