Naran
Blue color will help to reduce weight. The person should keep blue energy with them.
Bring blue color from blue world (imagine so). Fill all the organs with blue color and circulate it within their body.
They should affirm that blue is around them and meditate upon it.
Wear blue dress (often).
They should also do the Fire Mudra on both the hands. Do it by bending your ring finger and touch the base of the thumb.
Related blogs
Weight reduction using Mudras: http://wp.me/ptUIh-1h
Reducing your weight using a mantra: http://wp.me/ptUKY-5i