Advice on how to slowly increase more calories without gaining weight due to crash dieting. What should I eat? Ideas please!

Low carb diet. Research strongly suggests that simple carbohydrates (sugars, grains, corn, potatoes) cause more weight gain than other foods. I would emphasize salads/green vegetables, nuts & seeds, eggs & organically-raised chicken/meats & wild salmon. See www.Nytimes.Com/2012/07/01/opinion/sunday/what-really-makes-us-fat.Html and http://www.Drfuhrman.Com/weightloss/default.Aspx.