Good question. At 5'4" and 145lbs, you're BMI should be at a healthy number (although it's not always accurate because some people have more muscle mass than others). You can be healthy at 130, but listen to your body. You won't be considered underweight according to the BMI index if you were 130. Just make sure you exercise and lose weight in a healthy way. My goal is 125 and I'm 5'3". I want to be that, because my body was very happy with me at that weight.
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