I'd say it has nothing to do with your weight, and everything to do with increased fitness
You can carry a few extra pounds and still be fit and healthy - and I'm assuming that you're going based on BMI, which quite honestly isn't the best way of assessing weight, health and fitness. Most rugby players are obese according to their BMIs, but they're some of the fittest people you'll find!
If you can take the focus off of your weight and onto other measures of health and fitness then all the better for it 