I just came across Table 2 on pg 173 of "https://books.google.com/books?id=-rgoqmAF9icC&pg=PA159&lpg=PA159&dq=how+much+mass+would+a+snake+lose+before+it+starves&source=bl&ots=G89wh63BP9&sig=d6QmloQ3sMsOPS9PsPRzMd9s25I&hl=en&sa=X&ved=0ahUKEwj13Y6-2O3JAhVIJR4KHQ-VCyYQ6AEIJzAC#v=onepage&q=how%20much%20mass%20would%20a%20snake%20lose%20before%20it%20starves&f=false [Broken]". In the table, it mentioned that studied snakes had lost 55 grams of mass. It also mentioned that they had lost 976.9 "kJ". Now: does the "kJ" mean kilojoules, or just joules? When I divide 55 by 976.9, I get: 17.75 "kJ" per gram. When I however look up elsewhere what the energy values in joules are for the variously mentioned classes of biological substances the author mentioned (carbohydrates, fats, and proteins), I discover that carbohydrates and proteins have 16.8 joules per gram, whereas fats have 37.8. A proportion of these substances would then form a figure of 17.75 joules, but not kilojoules. There's a difference here by a thousand-fold! Or is it that there's some idiosyncratic and arcane practice in biological sciences to call joules kilojoules? What am I missing here?