do I have to eat my recommend calorie to lose weight?

It says for men that I should eat 1500 calories but since I have a herniated disc I can't run or anything but walk for so long only. So I thought less calories the better. So I've been eating fish and juicing veges and fruits. 1 cup of juice of vege/fruit and 2 fish. One for breakfast and lunch. Since I started I lost about 7 lbs. but I consider 2-5 lbs water weight. When I started this app I was at 176. Now I'm 173.

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