Thank you all for the very good advise, the links and the support!!
I learned a lot from all your messages.
If I eat less my body responses by keeping the weight on so I have to eight small portions during the day but must not do that in the evening.
The advise about enough sleep is thruth with me because if I can sleep longer I lose weight but cannot alway do that because I have to work!
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If it is possible on days I will sleep more.
I will going to mix up my workouts, I like that, also kickboxing/tae bo.
I read in a book to keep me motivated I have to set a goal. On the 19th June there is a sort of running event for pink ribbon in Rotterdam and I choose to run 5km. I do not know much that is in miles. I can train for that on my treadmill.