Will Circuit Training halt weight loss?.....

you will not lose fat and gain muscle at the same time. one needs a calorie deficit, the other needs a calorie surplus.

circuit training may halt weight loss temporarily but this is due to water retention, which happens whenever someone starts a working out for the first time. if your already 2 weeks in then your body has most likely already shed a good amount of this extra water retention.

i would continue, exercise is very important in keeping muscle mass while losing fat

It will halt weight loss temporarily.

It won't have any effect on fat loss provided you maintain a caloric deficit.

When picking up new exercises or changing your routine, your body will do funny things with water retention for bodily repairs.

As for muscle gain, it is possible you'll gain some muscle provided your body has enough spare hormone levels to do so, but this is usually only so for people that haven't been exercising for a significant amount of time (while in a calorie deficit). Much more complex than the simple "must have surplus to build muscle" but won't get too into it.

Anyway, yes, your answer... it can halt WEIGHT loss. Not fat loss.

I ask this because I started including circuit training into my workouts 2 weeks ago. I know the basic concept of muscle weighs more then fat ect. My question is will circuit training cause me to lose less weight since I am gaining muscle? I am still doing Cardio about 5 times a week and circuits 3 times a week and still tracking my daily calories. I know that weight lose is a slow process anyway but will circuits make this an even slower process?

It will cause your weight loss to temporarily halt if you start doing resistance style exercises because your muscles will retain water, not because they are getting larger. You will not put on muscle while at caloric deficit. I would definately include resistance training, as far as the weight gain its just water so who cares.

Definitely agree about the water retention, but then it can literally vanish overnight and you realise you have lost serious poundage. It will happen again if/when you increase the intensity.

I find that adding intense cardio intervals seems to blunt my appetite. I wouldn't call it HIIT though. I've been doing some Jillian Michaels DVDs recently and am not as hungry. She mixes resistance moves with cardio intervals such as mountain climbers.

Yes, I try to eat a little bit more on the days I do my circuits for that same reason. More protein mainly....

I just love the challenge that comes with circuits and cardio intervals. I would rather began building strength now then only do cardio. Plus it helps me break it up... I have to admit I can get bored pretty easy!

Thanks again for all of the GREAT ADVICE!

Sounds like a good plan to me, don't worry about the water weight it has nothing to do with your health which will be improving doing what you are doing (assuming your diet is appropriate).