Losing 25 pounds is 6 weeks if a really rapid loss so it sounds like you were on a very low carb diet. Everyone is not alike and perhaps you were too low carb for your body and exercise routine. I agree with the poster who suggested you LC at about 60 grams per day including plenty of veggies, some fruit, and some whole grains.

Most people end up modifying their LC plan based on what works for them. Losing weight is not the total goal--being healthy and feeling good is.