Losing a little weight is more expensive than lowering a lot. If you only have 5 kg left over, it means that you are closer to your healthy weight and, on these occasions, the body does not usually lower its volume of fat so easily.
Sometimes we tend to think that having to lose only a few kilos is not worth dieting. I recommend that you not be of the people who think like that. From my experience as a dietitian-nutritionist , often what starts out as 5 Kg, easily becomes 8 or 10.