I’m assuming they got carbohydrates elsewhere? That hardly seems like enough calories to last a working adult for a week. Also that’s a ton of sugar it’d take me at least a month to go through that amount but also I don’t drink tea like the Brits do.
WW2 weekly ration of sugar, tea, margarine, 'national butter', lard, eggs, bacon and cheese for an adult in the UK, WW2, 1942 (media.kbin.social)