Our expert says:
It could be - there's a few factors that affect how effective exercise is. Diet is the main one and the truth is that if you want to lose weight, then your diet is more important than your training. So, you need to consider seeing a dietican, as a once-off, to have some dietary advice given to you.
For the fitness, you're doing the right kind of thing. Aerobics is good - you might try other types of training to get some variety, but the 40 minutes daily is a good place to start.
But diet is crucial, and I'd encourage you to sort this out upfront!
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