I am loosing weight excessively I work 5 days a week anx eat 1 sometimes 2 meals a day I am 47 kilo and ment to be between 55 and 65 help?

Frequent meals. First step would be increase your intake by having frequent small meals, even, items like granola bars may help. If that does not help in about two months, it would be time to see a doctor to rule out other conditions, e.g., malabsorption, chronic infection, malignancy or other hidden illness.
See your doctor. There are many reasons you could be losing weight such as malabsorption, infections, diabetes, hyperactive thyroid or cancer but you need to see a physician soon to have am evaluation.