《细胞》最新警告：生酮饮食"瘦身陷阱"曝光！临床研究证实减重背后暗藏健康隐患：坏胆固醇飙升、肠道菌群严重失衡

Core Viewpoint - The article discusses the health implications of sugar consumption and dietary trends, particularly focusing on the effects of sugar intake and ketogenic diets on weight loss and metabolic health [6][8][21]. Summary by Sections Sugar Consumption and Health - Sugar, particularly free sugars, is linked to increased caloric intake and various health issues such as obesity and metabolic disorders. Reducing free sugar intake to below 5% of total daily calories could lead to a decrease of approximately 100 kilocalories in daily consumption [7][8]. - The article emphasizes that controlling sugar intake has become a central trend in modern dietary practices [8]. Ketogenic Diet Findings - A recent clinical trial involving 60 participants over 12 weeks revealed that while ketogenic diets effectively promote fat loss, they also pose potential health risks, including increased levels of "bad cholesterol" (LDL) and worsened glucose tolerance [9][10]. - The study included three dietary groups: a control group with normal sugar intake, a group with restricted free sugar intake, and a strict low-carbohydrate ketogenic group. Both the low sugar and ketogenic groups showed significant weight loss [12][15]. Metabolic and Microbiome Changes - The ketogenic group exhibited a significant decline in glucose tolerance and an increase in various low-density lipoprotein (LDL) particles, while high-density lipoprotein (HDL) levels decreased [16][20]. - Changes in gut microbiota were also noted, with a significant reduction in beneficial Bifidobacteria in the ketogenic group, which could increase the risk of digestive issues and infections [18][20]. Long-term Health Implications - The article warns that the long-term effects of ketogenic diets may include adverse changes in sugar and fat metabolism, which are associated with increased mortality risk even within "healthy" ranges of blood sugar and cholesterol levels [20]. - It suggests that while weight loss can benefit heart health, achieving this through a ketogenic diet may not be the best approach. Instead, simply controlling free sugar intake might be a more prudent choice for cardiovascular health [21].