When people are taught how to eat healthier, those on a low-fat diet end up eating about half carbs and a third fat, while those on a low-carb diet eat about a third carbs and almost half fat — and both groups stick to their plans similarly.
Evidence Quality Assessment
Claim Status
appropriately stated
Study Design Support
Design supports claim
Appropriate Language Strength
association
Can only show association/correlation
Assessment Explanation
The abstract reports observed intake levels, not causal effects. The claim describes a measured outcome, not a causal relationship. Verb strength is conservatively set to 'association' due to abstract-only access.
More Accurate Statement
“In overweight adults receiving 12 months of behavioral support, a healthy low-fat diet is associated with a mean macronutrient intake of 48% carbohydrates and 29% fat, while a healthy low-carbohydrate diet is associated with 30% carbohydrates and 45% fat.”
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.
Evidence from Studies
Supporting (1)
The study gave people two different healthy diets — one low in fat and one low in carbs — and helped them stick to it for a year. The results showed that people on the low-fat diet ate about 48% carbs and 29% fat, while those on the low-carb diet ate 30% carbs and 45% fat, just like the claim said.