Investors once speculated that Pfizer might consider acquiring Viking.Weight loss drugs have represented an enormous growth area for biotech and pharma companies over the past couple of years. Pharma giants Eli Lilly and Novo Nordisk dominate the market with their drugs and have brought in billions of dollars in revenue as demand skyrocketed. In fact, last year demand was so high -- surpassing supply at certain points -- that these drugs were on the U.S. Food and Drug Administration's drug shortage list.Sin ...