What are the reasons of feeling cold after starting a weight loss program?

BMR. Cold is a sign of low BMR check for thyroid levels and increase activity part either add walking or mini trampoline jumping indoors.
Depends. Lack of vitamin B12 can make you cold. B12 comes from meat which is probably limited on your diet and may need supplementation . Also if you are getting close to the end you may not have the fat reserves for proper insulation. Was the thyroid checked before starting the diet? Low thyroid is a common cause of feeling chilled.
BMR. Cold is a sign of low BMR check for thyroid levels and increase activity part either add walking or mini trampoline jumping indoors.