Vietnam sees widespread vitamin D deficiency despite sunny climate: doctor

At Hoan My Sai Gon Hospital's 2025 annual scientific conference, Dr. Tran Thi Minh Hanh, head of the hospital's nutrition department, said many people have limited sun exposure, contributing to vitamin D shortages. 

She estimated that about 50 percent of the population, particularly women, are affected.

Vitamin D is mainly synthesized in the skin through exposure to ultraviolet B rays. 

Groups at higher risk include office workers, older adults, children with heavy school schedules, and women who use sunscreen or cover up outdoors, according to Dr. Hanh.

Deficiency can lead to bone loss, osteoporosis, metabolic syndrome, and increased susceptibility to infections.

Dr. Hanh recommended 5–10 minutes of sun exposure per day, particularly between 10:00 am and 3:00 pm. 

In certain cases, supplements may be advised under medical supervision.

The conference also presented 31 research projects from hospitals in Ho Chi Minh City covering cardiology, gastroenterology, endoscopy, and orthopedics.