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Strong Support

If a woman who is overweight but otherwise healthy eats very few carbs for three months, her body starts making more of a fuel called beta-hydroxybutyrate — this means her body is switching to burning fat for energy instead of carbs.

55
Pro
0
Against

Evidence from Studies

Supporting (1)

55

Community contributions welcome

55

A randomized trial comparing a very low carbohydrate diet and a calorie-restricted low fat diet on body weight and cardiovascular risk factors in healthy women.

Randomized Controlled Trial
Human
2003 Apr

The study gave obese women a very low-carb diet and found that after 3 months, their blood showed a big increase in a chemical called beta-hydroxybutyrate — which means their bodies switched to burning fat for fuel, just like the claim said.

Contradicting (0)

0

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No contradicting evidence found

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.

Source Study

A randomized trial comparing a very low carbohydrate diet and a calorie-restricted low fat diet on body weight and cardiovascular risk factors in healthy women.

Score: 55
DOI: 10.1210/jc.2002-021480

Similar Assertions

When people with excess body fat eat very few carbs and more fats, their blood ketone levels rise quickly within two weeks, showing their body has switched to burning fat for fuel.

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When you eat a high-protein, no-carb, high-fat diet, your body starts burning more fat and produces a lot more ketones — a sign your body is switching to fat for fuel.

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When people don't eat for 3 days, their body produces more ketones (a type of fuel made from fat), which can be measured as rising levels of beta-hydroxybutyrate in the blood.

50
0
70%

If you eat a high-protein, no-carb diet for two days, your body starts making a lot of ketones — enough to be in ketosis. But if you eat carbs with the same protein, you don’t.

59
0
70%