I hate to defend this kind of dieting because I don't believe in it, but as many seem to have skimmed the article and now think it says he/they only ate 500 kcal per day I want to add this snippet from the article.
> "The addition of ketchup (and pan frying in oil) was for practicality, as we otherwise found it difficult to eat enough calories and lost weight too quickly (some days we were losing almost a pound of bodyweight due to ingesting only ~500 calories)."
> "The addition of ketchup (and pan frying in oil) was for practicality, as we otherwise found it difficult to eat enough calories and lost weight too quickly (some days we were losing almost a pound of bodyweight due to ingesting only ~500 calories)."