Core Insights - The research published in Cell Metabolism reveals the functional characteristics of gut microbiota at the protein level and its association with host factors, particularly in metabolic diseases and aging [3][4][7]. Group 1: Research Findings - The study analyzed 1,967 fecal samples from 1,399 middle-aged and elderly individuals in China, identifying microbial functions related to 44 phenotypes [4][8]. - It was found that the carbon metabolism and energy production functions associated with aging are driven by species from the Bacillota, Bacteroidota, Actinomycetota, and Pseudomonadota phyla [4]. - In various metabolic diseases, a consistent reduction in proteins related to carbohydrate metabolism, energy metabolism, amino acid metabolism, and short-chain fatty acid production was observed in Bacillota species [4][8]. Group 2: Key Microbial Insights - The study identified shared drug-related features in diabetes, hypertension, and dyslipidemia [4]. - Megasphaera elsdenii was confirmed as a pivotal species in type 2 diabetes, with experimental validation showing that antidiabetic drugs can promote its growth, potentially regulating blood glucose homeostasis through butyrate production [4][7]. Group 3: Implications for Treatment - The research highlights the potential therapeutic targets for metabolic diseases and aging-related conditions by elucidating the role of gut microbiota at the protein level [7][8].