In male smokers, replacing a small amount of unhealthy fats in the diet with carbohydrates is linked to a slightly reduced chance of developing type 2 diabetes over 12 years.

Pro

Against

Mechanism

Synthesis from 1 study

How it works

When you swap out unhealthy fats for carbs, less fat builds up in your muscles and liver. This helps your body use insulin better to pull sugar out of the blood, which over many years lowers your chance of developing diabetes.

Most probable mechanism

In Simple Terms

When unhealthy fats are replaced with carbohydrates, less fat builds up in muscle and liver cells, which helps these cells respond better to insulin, making it easier for the body to control blood sugar and lowering the chance of developing diabetes over time.

Causal chain

Reduction in dietary saturated and trans fatty acids decreases the delivery of fatty acids to skeletal muscle and hepatic tissue.

Supported by evidence

which leads to

Lower fatty acid flux reduces intracellular accumulation of lipid intermediates such as diacylglycerol and ceramides in insulin-sensitive tissues.

Indirect evidence only

which leads to

Decreased lipid intermediates restore insulin receptor signaling by reducing inhibition of insulin receptor substrate-1 phosphorylation.

Indirect evidence only

which leads to

Improved insulin signaling enhances glucose transporter type 4 translocation to the cell membrane in muscle and fat tissue, increasing glucose uptake.

Indirect evidence only

which leads to

Sustained improvement in glucose disposal reduces chronic hyperglycemia and pancreatic beta-cell stress, lowering long-term diabetes risk.

Indirect evidence only

Evidence from Studies

Supporting (1)

Community contributions welcome

Carbohydrate substitution for fat or protein and risk of type 2 diabetes in male smokers

Cohort Study

Human

2012 Jun

Contradicting (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

Carbohydrate substitution for fat or protein and risk of type 2 diabetes in male smokers

Score: 52

DOI: 10.1038/ejcn.2012.24

Similar Assertions

Among men who smoke, shifting their diet to get more calories from carbohydrates instead of fat or protein is linked to a lower chance of developing type 2 diabetes. This benefit does not appear to come from how quickly the carbohydrates raise blood sugar, suggesting other aspects of the diet or metabolism may be involved.

85%

In male smokers, replacing fat or protein with carbohydrates of different glycemic indexes—low, medium, or high—does not result in different levels of risk for developing type 2 diabetes.

83%

In male smokers, swapping total fat in the diet for carbohydrates with a medium glycemic index is linked to a small decrease in the likelihood of developing type 2 diabetes. Replacing fat with low- or high-glycemic index carbohydrates does not show a clear link to changes in diabetes risk.

82%

Eating saturated fat doesn’t always make you more likely to get heart disease or diabetes—it depends on what foods you’re getting it from and what you’re eating instead.

80%

In male smokers, replacing a small portion of protein from meat, milk, or plants with carbohydrates over 12 years is linked to a 15% reduction in the likelihood of developing type 2 diabetes, regardless of how much total protein is consumed.

80%