Inclusion Criteria:  General doctors, specialist doctors, nurses and midwives who are in charge of handling COVID-19 patients or working in COVID-19 referral hospitals for at least the last 3 months 20-65 years old Willing to sign informed consent Willing to follow the research to completion BMI > 23 kg/m2  Exclusion Criteria:  Pregnant woman Have a confirmed history of COVID-19 based on previous PCR examinations Suffering from acute illness known from history and physical examination or chronic disease (eg diabetes, SLE, cardiovascular disease) known from history Currently not on a diet program for weight loss or consuming probiotics regularly in the last 3 months as known from the anamnesis