Am I eating enough?

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I know there are many posts on here about this but I am struggling currently to get the weight off. I am currently 173.8lbs. I would like to get down to 150. I have been exercising 6 or 7 days a week. Cardio almost every day with running(2 miles) and 3 times a week weight lifting for 4 weeks and have only seen a 4.6lb loss. I am having trouble figuring out how many calories to eat. I was told by a friend that I should be eating 2000 calories a day, I have been eating between 1200 and 1700 a day. Is this not enough? I am afraid I will start to gain if I eat more.

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