I was think of the nursery rhyme that goes:
Jack Sprat would eat no fat.
His wife would eat no lean.
But, together both they
licked the platter clean.
Now, all the pictures associated with this rhyme show a super skinny Jack with his fat wife.
But if Jack’s eating all carbs and his wife is high fat but low carb, he could very well be the obese one and his wife the skinny one!