(1) To lose weight : –
One can do Vajrasana, Paschimottanasana, Matsyasana, Muktasana, Trikonasana, Bhujangasana, Naukasana etc.
2) For constipation : –
Vaayusar, Shankh Prashlasana, Pawanmuktasana, Shitkaari, Vrajasana, Shalabhasana, etc. can be done.
3) For Diabetes : –
Asanas like Namanamudra, Sinhasan, Kapalbhati will be very useful.
So now you need this asana to get rid of your many diseases.