No you can not loose with k challenge
And in short time you can not loose atlest should give 1 month time to your body
I need your complete information so that i can tell you how mucu kg you can loose
You did not mention your height, weight, current eating habits, current lifestyle etc.
Next Steps
avoid junck food
eat home made food
you need to take balance diet
avoid doing crash of Fad diets which give in short time good weight but further many health complecation
always consult qualified dietician or nutritionists.
Health Tips
start doing daily workout for 45 min
take direct consultantion through my practo account so will able to plan diet plan as per your body requirements
and there are many reasons that you gain weight need to find out root cause