This study of inter-relationship between life styles and diabetes mellitus, overweight/obesity and hypertension was carried out to determine the life styles of the bank workers and the nutritional related diseases. A total sample of 570 was systematically drawn from workers of the United Bank for Africa Plc in Lagos for this study, with the following results. Not surprisingly the level of education influenced life style (P<0.05). There was also a statistically significant relationship between life style and the consumption of alcohol and diabetes, but no relationship was found between smoking and diabetes. There was a significant correlation with their consumption of fatty foods and vegetables. A relationship between increased protein intake and an increase in educational status (P<0.05) was found. There was association between obesity and hypertension (P<0.05), and between increase in frequency of clinic visitation and hypertension which was statistically significant (Chi square P<.05).