For years I have been asking the question: How To Gain Weight healthy?
Most people sabotage their weight gain efforts by clinging to restrictive eating patterns. There are two fundamental things, ONE: get over your restrictive eating habits and TWO you need to eat more calories.The quality of the foods we eat contributes to weight release and/or storage.
The goal is to do this without eating foods that are loaded with sugar, low-quality fats, and simple carbs.
Adding Brown rice, dark beans, vegetables, and avocado to your diet, that is a good start if you want to gain weight.
Eat foods that are rich in calories, like avocados, nuts and nut-butters, coconuts and certain whole grains. These foods will easily add caloric density to your meals in a healthy way. Snack on foods that are calorically dense. (FYI: most fruits and vegetables are “low” caloric dense compared to lean organic meats.) Try a nutrient dense (Veggie & Fruit) smoothie. You can also try making one with 2 bananas, 2 tbsp of nut-butter and some fresh organic nut-milk. I read that Oatmeal is also great for tossing into smoothies! These calorie rich snacks offer energy without too much bulk. Increase the size of your meals.
Eat every day a little more. As long as you’re making room for the major food groups—Veggies, Legumes (beans, peas, lentils etc), Whole-Wheat, some high-quality soy (fermented if possible), Sea veggies, green juices & smoothies, fruits, and nuts & seeds.
If you do only half; of what is suggested here, you have no reason not to gain weight.(Except there is a real health issue, than PLEASE visit a Health Professional.) Over time, this will add up to the positive results, which you are looking for. Healthy weight gain tends to come slowly and then it happens quickly. So if you’re at the start of a weight gain journey, remember that consistency and effort will pay off with time, with patience and healthy food.
PS: Sea veggies: If you think you’ve never eaten a sea vegetable before, think again. Food manufacturers often use processed sea vegetables as thickeners or stabilizers in all types of common products, from instant pudding to toothpaste. Buy organic ones! Those are available in most Health food stores, Whole Food Markets & Asian markets.
Look for: Alaria: is biologically and nutritional,
Dulse: it’s reddish brown, full of potassium and protein and Hijiki; which is a black fibrous. Seaweed in general rich on dietary fiber and helps with cellulite control, detoxification, beautiful hair and skin.
PSS: Sea “weed” are one of the richest sources of minerals in the vegetable kingdom. Sea vegetables contain high amounts of calcium and phosphorous and are extremely high in magnesium, iron, iodine and sodium. For example, 1/4 cup of cooked hijiki contains over half the calcium found in a cup of milk and more iron than in an egg. They also contain vitamins A, B1, C and E, as well as protein and carbohydrates. One of seaweed’s most prominent health benefits is its ability to remove radioactive strontium and other heavy metals from our bodies. Whole brown seaweeds (not granulated!!) such as KELP seaweed, it contains alginic acid which binds with the toxins in the intestines rendering them indigestible and carries them out of the system. It can be added to salads or it can be used as a wrap for a variety with your favorite fillings.

Author's Bio: 

My successful twenty plus year career as a professional Operations Manager, in which the majority of my time was spent holding people accountable, led me to become an Accountability Coach in various areas, from entrepreneurial start-ups to weight loss. My strongest interest is in Natural Health, Alternative Medicine and wellness. I work with private clients who are seeking to achieve maximum success with their health and wellness goals. I interact with clients One-on-One, teaching and informing them about Natural Health, Alternative Medicine and wellness. Most importantly, I hold them accountable so that they can reach the goals that we have set out.