The weight loss drug market may reach $95 billion within five years.The new generation of effective weight loss drugs has generated billions of dollars for industry leaders Eli Lilly (LLY -0.96%) and Novo Nordisk (NVO 1.39%), and opened the door for companies such as Viking Therapeutics and Amgen that are working on rival new candidates.The growth of this healthcare niche looks to be far from over: While the weight loss drug segment is expected to be worth $28 billion this year, Goldman Sachs Research predi ...