Effect of collagen peptides on cognitive function

INTERVENTION: CH group: Collagen peptides 5g / day taken orally for 3 months. Placebo group: Maltodextrin 5g / day taken orally for 3 months. CONDITION: Non PRIMARY OUTCOME: MCI, HbA1c, blood sugar, blood insulin, AGEs SECONDARY OUTCOME: Pulse wave velocity, carotid echo, grip strength, sway of gravity, single‐leg standing test, general blood collection (anemia, liver function, kidney function, LDL cholesterol, HDL cholesterol, triglyceride, BNP, thyroid function, etc.), bone density measurement, questionnaire INCLUSION CRITERIA: 1. Healthy person aged from 40 to 90 years old. 2. HbA1c is 6.0% or less. 3. Intake rate of 80% or more for 3 months.