 This study found that high adherence to the Mediterranean diet was associated with improved quality of life, higher levels of physical activity, and a more adequate sleep quality score in a representative Greek elderly population. These results suggest that strategies and public health policies that facilitate Mediterranean diet adherence and physical activity in older adults may improve sleep and quality of life, impacting overall well-being in this age group. This article was authored by Maria Manzirou, Maria Menzila, Georgios, Kevejos, and others.