Assertion: margarine | /r/HasProperty | marketed as the butter substitute
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text: In all the time since then, nobody ever thought it problematic – until the 1950s, where a new trend emerged: while margarine was first marketed as the butter substitute that it was, with a goal to resemble butter as much as possible, new research at the time suggested that saturated fats and cholesterol – as found in butter and other animal fats – were unhealthy and linked to heart disease (Keys 1953 & 1970 in Ravnskov 1998).