
What Causes Weakness, Fatigue, Lightheaded Feeling And Fullness Of Stomach?

1500 calories is not enough.
Detailed Answer:
Hello,
Welcome to Healthcare Magic.
Teen girls around the 19 years need about 2000 calories per day. Active teen girls need about 2400 calories so you are not eating enough calories.
Your body needs these calories to work. Because it does not get them you feel tired. Neurotransmitter production is limited which can lead to lack of motivation. So that's why you feel weak and light headed.
When you are not consuming enough calories your stomach empties slower and the lining of the intestinal tract can shrink. And in this situation your stomach can "feel" full when you are not eating enough.
You should eat more. Try to eat at least 5 times a day.
Hope I have answered your question. If you have any further questions I will be happy to help.

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