If dairy is already a staple in your diet, switching to fattier versions can be an easy way to gain weight. Full-fat milk -- also called whole milk -- is higher in calories than its reduced-fat counterparts, which helps provide the extra energy you need to put on a few pounds.

The best techniques for weight gain don’t always take busy lifestyles into account. Having larger portions at meals, eating more often during the day and incorporating avocado, healthy oils and whole grains into your regimen are sound strategies for weight gain, but sometimes you’re on the go.

Fruits have nearly three times the calories per serving as vegetables, making them an effective way to add nutritious calories and gain weight. Some fruits are more watery and fibrous, which only fill you up so you can't eat additional calories.

When fighting cancer, your appetite and nutritional requirements alter due to a variety of factors from emotional stress to cancer treatment. You may lose your appetite, and your energy levels decrease.

If you're trying to gain weight, flaxseed oil provides you with essential fatty acids as well as additional calories. Flaxseed comes from the pressed seeds of the flax plant, and you can add it to smoothies, drizzle it on top of cereal or mix it into a salad dressing.

Diverticulitis is a digestive disease that affects your colon. Many people develop small pouches, caused by the pressure of constipated stool pressing against weak spots in the intestinal wall. Sometimes these sacs become inflamed, creating the painful and potentially serious condition called diverticulitis.

If you want to put on weight, you must follow a specific diet to do so to ensure that you achieve your goal in a healthy manner. Certain foods can help you to put on lean muscle, when combined with exercise, which remains the healthiest way to gain weight.

A sumo wrestler's success depends on his weight. The larger the wrestler, the better chance he has in the competition. A sumo wrestler's diet, therefore, is aimed entirely at helping wrestlers to gain weight as quickly and efficiently as possible.

Brewer's yeast is sometimes used as a supplement to increase energy levels and to provide chromium, B vitamins, selenium and protein. Because of the chromium Brewer's yeast contains, it may be more likely to help with weight loss than with weight gain.

Low body weight, also known as failure to thrive in children age 2 or under, can lead to serious repercussions for your toddler.

When you need to fill out to look and feel healthier, add quality calories to your meals to encourage weight gain. To gain weight, your caloric intake must exceed what you burn in a day through basic body functions like pumping blood, plus other activities such as doing chores and exercising.

Compared to younger adults whose main goal is often keeping their weight down, many seniors need to keep their weight up. With age, muscle mass naturally decreases, and appetite reduces, putting older adults at risk of being underweight.