However, several indicators that can be linked to a higher risk of overweight/obesity were identified, e.g., increasing alanine aminotransferase (ALT) levels were found to be associated with higher PFOA, PFNA, PFHxS, and PFOS levels in adults, obese adults, and obese children (e.g., [30,32,33,34,35]). Here, GPT is linked to obesity due to melanocortin 4 receptor deficiency.