I have been a regular yoga practitioner. For various reasons, the last year has been erratic, and thyroid has ruined havoc, I have become obese (I am 42 and weigh 90 kgs- my ideal weight is 57 kgs - I am 5'4'), and a sudden crick n my right knee shows the xray as osteoarthritis. I am extremely depressed as both the allopathic and the ayurvedic doctor have barred me from doing vajrasan/any asana that require folded legs. And while I am aware that degenerative process starts in all humans, I am shattered that with a disciplined life, I have invited this. Please advise on the right diet and lifestyle for me. The faster ways of losing weight I cannot follow now thanks to the knee. Your guidance is earnestly sought.