Still no luck

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I went on a new diet (low fat and low carbs) about 2 weeks ago. My daily caloric intake was 1700 calories. After the first week I was down to 193.5 from 195. However, this week, I am back to 195. My caloric intake has not changed, nor has my exercise routine. I do 3 days of 90 minutes of hot yoga (vinyasa flow) and the rest of the week I do a combination of running 2 miles and weight training. Does anybody know what I could possibly be doing wrong?

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