any ideas how to lose the last 6kg

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I have dieting with great success for a year!!! but have hit a rut for 2 weeks, last week I didn't lose any weight even though I cut my calorie intake by 200 and did extra 15mins of cardio a day ..... to no avail. So I decided to have a cheat weekend so I put on a 1.5 kg over the weekend and back to the dieting and exercise on Monday and I haven't even lost the weekend weight as yet..... which has me dreading trying to lose the last 6kg