weight gain

i've been eating more than usual but for some reason im not gaining weight, why is that? i've always had a large appetite but have remained a petite girl, why has my apetite all of a sudden risen?

[bestbreathe]

Many people eat a lot but barely gain weight. Eating alone will not help you gain a lot of weight. You need to put eating schedule into a system. The system composed of the 4 steps above.  
1. More calories must be consumed than used. Each person requires different amount of calories. If you need to calculate calories you need to consume based on your body, activities, and other factors.
   2. Adequate exercise - particularly muscle-building workout such as weightlifting and strength training--must be done.
   3. Good nutrition is also important. As you work out, your body uses a lot of minerals. And if your body doesn’t get enough of essential vitamins, the muscle growth and weight gain will be discouraged.
   4. Finally, you need to have discipline in the above 3 steps in order to succeed at gaining weight.

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