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How to gain weight fast (for women ) 
Consume an additional 500 calories per day. 
It is generally safe to gain 1-2 pounds (0.45-0.91 kg) per week. To reach this goal, add an extra 500 calories to your diet everyday.
The healthiest way to do this is to eat more nutrient-dense foods. To keep track of what you're eating, use a health app, such as myfitnesspal.