Trying to tone up but I don't want to change my diet.

tlerias

So i'm fairly satisfied with my weight, but I am not the healthiest eater in the world. I started working out a lot these past couple weeks, and I was wondering if it was essential for me to change my diet for me to start toning up. I'm in college, and I havent really worked out in like three years. I started taking a cardio kickboxing class 3 times a week for 60 minutes, and I do yoga tuesday, thursday and usually saturday and sunday. Do you think this is enough for me to tone up? I'm not overweight, i'm 5'1 and I weight 110 pounds. There is just some belly fat I would like to get rid of and I would like toner arms and legs. Thank you for any feed back.