To tell you the truth, I found it really difficult to get a lot of information on how to gain weight. The emphasis is on losing weight, as a large percentage of the society is obese, so the internet is full of diet tips for them. But what about those who are too thin? Is there anything they could do? Well, adding more meat to your diet is not the healthiest option, but fortunately, there are other ways as well. Eat a lot of nuts and seeds. Flaxseed is also a good choice, and it provides the best quality omega-3 fatty acids. Avocados and pasta are also good for you. Generally, do not overload your digestive system. Instead of eating huge meals, which cannot be absorbed very well, try having five or six smaller meals a day. You should not only increase the fat intake. Focus on general calorie number, which should be higher than your average. Do not change the proportions between fat, carbohydrates and protein. Include five to nine servings of vegetables and fruit. These are the diet tips that might help you, but what about exercise? Consider taking up some anaerobic exercise such as weightlifting! Well, just visiting the gym should be enough. You will not gain fatty tissue, but become more muscular instead.