Ideally you should aim to gain weight steadily at a rate of around 2lbs per week.
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Don’t worry if your rate is slower, if you’re making progress and seeing the number on the scale go up, then that’s what’s important.5
Fast weight gain isn’t recommended because it may not help you correct any nutritional deficiencies you may have and it doesn't build up muscle mass, which is a much healthier tissue than fat.
While slower weight gain means it takes longer to put on weight, it enables you to put on healthy muscle rather than just unhealthy fat.
Muscle takes more work to develop; around 1/2 pound a week.
The healthiest way to build muscle – and put on weight – is to combine strength training with an increased calorie intake, especially from protein.
Approximately 0.5g of protein per pound of body weight is the ideal daily goal. Foods such as poultry, lean steak, fish, tofu, and dairy are among the best protein sources.
Summary
- Aim to gain weight steadily at a rate of around 2lbs per week
- Fast weight gain isn’t ideal because it may not help you correct nutritional deficiencies and it doesn't build up muscle mass
- Slower weight gain enables you to put on healthy muscle rather than just unhealthy fat