Inverse correlations were also found between Faecalibacterium, a butyrate producer from the Ruminococcaceae family with anti-inflammatory and immunomodulatory properties [44], already known to be less represented in obese, metabolic syndrome and type 2 diabetes patients [45], and weight (tau = −0.326, p = 0.05), BMI (tau = −0.354, p = 0.03), waist circumference (tau = −0.383, p = 0.02), fasting glucose (tau = −0.34, p = 0.04) and leptin (tau = −0.337, p = 0.04). Here, LEP is linked to metabolic syndrome.