The investigators conduct a randomized, double-blind, placebo-controlled study to investigate the effects of oral ingestion of drinking water using a tumbler that emits far infrared rays at room temperature on metabolic profile in adults for 8 weeks.

The investigators conduct a randomized, double-blind, placebo-controlled study to investigate the effects of oral ingestion of drinking water using a tumbler that emits far infrared rays at room temperature on metabolic profile in adults for 8 weeks; the safety of the compound are also evaluate. The Investigators examine lipid profile, glucose, liver and renal function at baseline, as well as after 4, 8 weeks of intervention. Thirty adults were administered either 1.8 L of drinking water using a tumbler that emits far infrared rays at room temperature or drinking water using a sham-tumbler each day for 12 weeks.

Inclusion Criteria:

• 19 years and older

Exclusion Criteria:

• aspartate aminotransferase (AST) or alanine aminotransferase (ALT) more than twice the highest reference value
• serum creatinine ≥ 1.5 mg/dL)
• uncontrolled diabetes mellitus (a fasting glucose of >160 mg/dL)
• uncontrolled hypertension (BP > 160/100 mmHg)
• severe gastrointestinal symptoms
• alcohol abuser
• pregnant or lactating women
• allergic to the ingredient involved
• cardiocebrovascular diseases or any cancer during the six months prior to study
• smoker