Health Professional
The Accredited Practising Dietitian members of Healthshare are better able to offer you detailed advice than I am.
My understanding is that a weight-loss of 1 kg/week or so is seen as being sustainable - more than that may not be.
You might find the general information here helpful; http://www.betterhealth.vic.gov.au/Bhcv2/bhcarticles.nsf/pages/Weight_loss_a_healthy_approach?open
All the best.
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