Losing weight too fast can be as dangerous as not losing weight and it is vital you do not try to be too drastic in your approach. It is widely documented that 1-2lbs (approx. 0.5kg-1kg) of weight loss per week is considered a safe range. Although participants will have different starting weights, this means that safe weight loss could be considered losing a maximum of 1% body weight per week.
Remember, permanent weight loss is not something that a quick-fix diet and short term activity can achieve. Instead, think about weight loss as a permanent lifestyle change; a commitment to your health for life. Various popular diets can help to jump-start your weight loss, but permanent and combined changes in your activity levels and food choices are what will work in the long run.