The health benefits of a month off booze include (Mehta et al., 2018):

• An average 26% reduction in insulin resistance (This occurs when the hormone insulin becomes less effective at making the body remove sugar from the bloodstream, raising the risk of type 2 diabetes.)
• Improvements in liver health.
• An average 13% fall in cholesterol levels.
• A 6% drop in blood pressure.
• A 1.5% decline in weight.
• Reduction in cancer-related growth factors.

Reference

Mehta, G., MacDonald, S., Cronberg, A., Rosselli, M., Khera-Butler, T., Sumpter, C., Al-Khatib, S., Jaan, A., Maurice, J., Charalambous, C., Gander, A., Ju, C., Hakan, T., Sherwood, R., Nair, D., Jalan, R. & Moore, K.P. (2018) Short-term abstinence from alcohol and changes in cardiovascular risk factors, liver function tests and cancer-related growth factors: a prospective observational study. BMJ Open. 8(5). https://bmjopen.bmj.com/content/8/5/e020673.