1847
Mulder recommended 100 grams of protein per day for a labourer and 60 grams of protein a day for a sedentary person. According to Harper, these were probably the first dietary recommendations for a specific nutrient and were based on his studies of Dutch Army rations.
Harper, A.E. (2000) Recommended Dietary Allowances and Dietary Guidance. Cambridge World History of Food. Cambridge University Press.