If you’re underweight or heading in that direction, a steady, consistent plan for weight gain will work better for you than any quick-gain method. In a period of 10 days, a woman can safely gain a little over a pound if she follows a nutrient- and calorie-dense diet combined with strength training to build muscle.

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.

Your friends may consider you lucky, but you may not feel that way if you're super skinny. If you're hoping to put on a few pounds, simply eating more isn't all there is to it. For healthy weight gain, you need to eat the right foods and find time to work your muscles, too.

Ativan, the brand name for the generic medication lorazepam, has long been used as an anti-anxiety drug. Ativan belongs to a class of drugs called benzodiazepines, which act as central nervous system depressants. Weight gain isn't a common side of a Ativan, but could occur in some individuals.

Glutamine is an amino acid essential for muscle strength. It serves as a building block to protein, helping to synthesize this nutrient in the body. Due to its necessity in the maintenance of muscles, questions still remain about this amino acid's effect on weight.

Ayurveda is a holistic healing system that originated in India approximately 5,000 years ago. Ayurveda, which translates from Sanskrit as "life knowledge" or the "science of longevity,"

The National Library of Medicine states that over 40 percent of Americans are overweight. Rapid weight gain can be caused by a variety of medical conditions, or it can be due to an unhealthy lifestyle and diet.

Your best friend seems to eat everything in sight but never gain a pound, while you look at a slice of cake and start packing on pounds. It may be the luck of the genetic draw, but diet and lifestyle factors also help determine how you manage your weight.

There are several common diseases that can lead to the inability to gain weight -- but there could also be a simpler explanation, such as not getting enough calories in your diet.

Phentermine (duromine) is a prescription dietary aid intended for short term use by people who are seriously overweight or obese, according to the Mayo Clinic. Duromine is meant to be used in combination with physical activity and a medically supervised weight loss plan.

Gaining weight around the midsection must be done through eating select food types and avoiding any activity whatsoever. This is not a difficult plan to undertake -- but not a healthy solution to any person's particular circumstance -- and can be done quickly and effortlessly.

Weight loss after breaking your jaw is common. The surgery to fix this fracture requires wiring of the jaw, and for approximately three to six weeks after surgery you will have limited movement of your mouth and jaw to allow healing.