The odds ratio (OR) of malnutrition risk in older adults who are non-smokers, do not take SSRIs, do not have frailty syndrome, and do not experience a loss of appetite, with median values for appendicular muscle mass index (ASMI: 7.70 kg/m2), visceral adipose tissue (1.86 L), and CCK-8 levels (160.6 pg/mL), is 0.12 (equivalent to a probability of 0.11). This evidence concerns the gene CCK and nutritional deficiency disease.