Nutrition advocates want investors to improve food sector practicesWASHINGTON — Shareholder coalitions say the power of investor money can be harnessed to press the food industry to provide more nutritional foods and still improve the companies’ bottom lines. But it could take years for nutrition to climb the priority list for many investors despite the spotlight a September White House conference on hunger, nutrition and health placed on the role nutritious foods can play in preventing or moderating diet-related conditions such as obesity, hypertension and Type 2 diabetes. The conference didn…