Does magnesium level in the body fluctuate all throughout the day? my magnesium was one point under the low end of the range due to drinking alcohol and poor diet. can eating the right foods get it back in normal range?

Magnesium fluxes in and out of cells and bones and may have to have better evaluation to determine if total body amount is okay, rather than depending on the value in the blood alone. Eating right and eating food with high magnesium content should help and there is also the option of taking tablets for quick corrrection when it is very low. Alcohol is empty calories that is bad for brain and liver

Yes. Alcohol is a poison that never did anybody any good, ever, so stay away from it. It will destroy your brain cells, facilitate development of cancer in many organs, including breast, cause hepatitis, cirrhosis and pancreatitis etc. There is no safe level of alcohol intake. Quit while you are ahead.