Summary: This clinical trial examined how L-carnitine supplementation combined with motivation training affects weight management in overweight Japanese men. The 4-week double-blind study involved 24 participants divided into four groups: L-carnitine with motivation training, L-carnitine without motivation, placebo with motivation, and placebo without motivation. Each L-carnitine group received 500 mg daily.
The most significant results came from the L-carnitine plus motivation group, which showed notable improvements across multiple metrics:
- Average weight loss of 1.1 kg (compared to weight gain in other groups)
- Decreased serum triglyceride levels from 218 to 145 mg/dL
- Increased adiponectin levels, indicating improved metabolic health
- Increased physical activity (from 5,934 to 8,617 daily steps)
The motivation training included face-to-face sessions about L-carnitine’s metabolic functions, guidance on physical activity, and instructions to maintain daily records of weight and step counts. While the L-carnitine-only group showed some improvements in triglyceride levels, the addition of motivation training significantly amplified the supplement’s benefits.
The researchers concluded that low-dose L-carnitine supplementation, when combined with motivation training, could be an effective strategy for weight management and improving metabolic health markers. The study also highlighted the importance of including behavioral support in weight management programs, as motivation training enhanced the effectiveness of the supplement intervention.
No significant adverse effects were reported, suggesting this approach is safe for healthy adults. However, the researchers noted study limitations including the small sample size and relatively short duration, recommending longer-term studies with larger populations.
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