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Using observational data on \\(^4\\mathrm{He}\\), deuterium, and \\(^7\\mathrm{Li}\\) abundances, we place stringent bounds on the Yukawa coupling \\(\\alpha\\). The \\(^4\\mathrm{He}\\) and deuterium constraints are mutually consistent (\\(-0.24 \\lesssim \\alpha \\lesssim 0.12\\)), while \\(^7\\mathrm{Li}\\) requires $\\alpha \\in [-0.76,\\,-0.72]$. 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