Aged Hearts More Vulnerable to Sugar-Induced Enlargement, Study Finds

Cardiac hypertrophy, or the pathological enlargement of the heart, is a significant risk factor for heart failure and other cardiovascular diseases. While high sugar consumption is widely recognized as a contributor to metabolic dysfunction and heart disease, the specific impact of aging on the heart's susceptibility to sugar-induced damage remains less understood. This study addresses how the aging process modifies the heart's response to chronic high sugar intake, aiming to identify age-specific vulnerabilities.

The study revealed a pronounced age-dependent susceptibility to sugar-induced cardiac hypertrophy. Aged mice on the high-sucrose diet exhibited a significant 28% increase in heart weight-to-body weight ratio compared to aged controls (p<0.001), indicating substantial heart enlargement. In contrast, young mice on the identical high-sucrose diet showed only a modest 7% increase in this ratio, which was not statistically significant. The most striking finding was that aged mice consuming the high-sucrose diet developed 3.8-fold greater cardiac hypertrophy (measured by heart weight-to-body weight ratio) compared to young mice on the same diet (p<0.0001). Histological analysis further confirmed these findings, with aged high-sucrose mice displaying 35% larger cardiomyocyte cross-sectional areas compared to aged controls. Additionally, gene expression of cardiac stress markers, such as ANP (atrial natriuretic peptide) and BNP (brain natriuretic peptide), was 2.5-fold higher in the aged high-sugar group compared to young high-sugar mice (p<0.01).