Table.1 Articles included in Systematic Review

Yuan et al., [36]

China

To investigate gender and age as moderators in the association between

BMI and mild cognitive impairment (MCI) among rural older adults

Cross-sectional

Aged 60 and above (Range from 60 to 100 )

Age scategorised into

Below 75 and above 75 .

n = 3242

BMI

[sCategorised into underweight (low BMI), normal weight (normal BMI), overweight (elevated BMI) and obese (high BMI)]

MMSE

(30 Items; Chinese Version)

Below 75 years (Both men and women)

There was no significant difference in MCI among overweight and obese categories when compared to normal BMI. (p>0.05)

Above 75 years.

Older men

Compared to nomal BMI category, Overweight category had higher risk of MCI (aOR = 2.32, 95 % CI: 1.17–4.61; p<0.05)

Older women

BMI (overweight and Obesity) vs. MCI – NS

Salama et al., [37]

Egypt

To assess MCI prevalence and its relation with lifestyle

risk factors among obese adults

Case-control

Mean age case (Obese) – 52.1± 5

Mean age control (Healthy) – 51.3± 6

Case (Obesity) n=161

Control (Healthy) n=69

BMI

Obesity Gr. I (BMI <35)

Obesity Gr. II (BMI 35-39.9)

Obesity Gr. III (BMI>40)

ACE (Version III)

MCI was assessed between Obesity categories (I, II and III) and control (healthy adults)

MCI between Grade I and Control (OR – 5.5, 95 % CI: 2.2-13.5; p<0.001)

MCI between Grade II and Control (OR – 6.8, 95 % CI: 2.7-16.9; p<0.001)

MCI between Grade III and Control (OR – 4.8, 95 % CI: 1.8-12.5; p<0.001)