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For years, the promise of wearable technology has been growing: what if your watch could tell you what was happening inside your body before you ever felt a difference? It seems like everything is tracked by tech: body temperature, heart rate, blood sugar levels, blood oxygen levels, menstrual cycles, and now, even changes in insulin…

A landmark Swedish study published Tuesday found that the composition of bacteria in your gut can reliably flag your risk of developing type 2 diabetes years before blood sugar levels reach any clinical threshold — and that whether those bacteria protect you or harm you may depend almost entirely on how much fiber you eat