Joan Martínez Alier has made relevant contributions to the agrarian question by treating the southwestern Spanish latifundio and Latin American hacienda systems as capitalist ways of exploiting land and labour, not as backward feudal remnants. He has also invoked the resistance of Latin American tenant-labourers and other smallholder peasants as an explanation for the limited extent of wage labour. To that end, he helped rescue Alexander Chayanov and the former Narodnik movement from oblivion. With José Manuel Naredo, he paid tribute to Sergei Podolinsky, another member of this peasant neo-populist current, for pioneering the first calculation of energy balances and returns from agricultural systems. As agricultural and environmental historians, we have followed both paths to develop new proposals for a form of agrarian metabolism that, while contributing to ecological economics, is also aligned with agroecology. We summarize our contributions to these topics, developed together with Eduardo Sevilla Guzmán, Victor Toledo and Gloria Guzmán, as well as some of the researchers at the Institute of Social Ecology in Vienna and many other participants in the international project on Sustainable Farm Systems (SFS). Our teams have also started using these socio-metabolic accounts to take up the agrarian question of labour and gender exploitation through the unequal appropriation of natural resources from a historical point of view, as well as contribute to the next agroecology transition to a fairer food regime within planetary boundaries.