The current study aimed to estimate of Magnesium Mg+ in adults in Obesity, Overweight and Normal weight and compare them and the relationship of magnesium with Body mass index BMI ,waist circumference WC and lipid profile Materials and Methods: This study included 100 people (29) 29% males and (71) 71% females whose ages were over 20 years old. They were Also divided according to nutritional status into obese group, overweight group and normal weight. The information required for the samples was recorded and BMI was measured, WC , Mg level and lipid profile were measured. Results: The results showed a decrease in the magnesium level in the obese as well as in the overweight and it was normal in the normal weight. The level of magnesium decreased in women and was higher in men in all feeding conditions, and the BMI of women was higher than that of men. The results of this work showed that there is an inverse negative relationship between Mg and each of BMI, WC, TCHO, TG ,LDL while the positive correlation between Mg and HDL.Conclusion: In finally, magnesium deficiency can be considered one of the factors that lead to obesity, and diseases associated with obesity.