How to lower both triglycerides and fasting blood sugar

For many adults, reducing carbohydrate intake is one of the most effective dietary changes for lowering both triglycerides and fasting blood sugar. Studies often define “low-carbohydrate” as 44% of daily calories or less. That is a moderate reduction from typical intake, which tends to sit around 50% or higher, not an extreme diet.

This works because when you reduce your carb intake, your body pumps out less insulin—the “storage hormone”—which acts like an all-clear signal to help your system flush fat from your blood and sugar from your veins simultaneously.

Can one change really help both numbers?

Recent data from a massive review in the European Journal of Nutrition (2026) confirms that you don’t need two separate plans to tackle these issues. Think of your liver as having a “metabolic reset button.”

When you stop overloading it with glucose from excessive carbs, the liver stops churning out extra fat (triglycerides), and your body becomes much more efficient at managing the sugar already in your system.

Marker	Effect of low-carb diets (Hedges’ g)	What it means
Fasting blood sugar	-0.364	A modest but consistent drop
Triglycerides	-0.379	A modest but consistent drop
HDL (“good”) cholesterol	+0.389	A modest increase

These are average effects across studies. Individual results vary, and the review looked at healthy adults, so people with diabetes or established heart disease should interpret the numbers with their care team.

Do I have to cut out all carbs?

 The research defines a standard low-carb diet as anything at or below 44% of your total daily calories. Within that, you have two paths you can take depending on your goals:

• The Moderate Path (≤ 44% of calories): This is the sweet spot that the European Journal of Nutrition found effective for balancing blood sugar and fats in healthy adults.
• The Intensive Path (< 26% of calories): According to the BMJ Medicine (2023) umbrella review, dropping below this line provides “high certainty” results for those needing to make a more significant impact on their markers. A stricter diet is harder to sustain and is where medication adjustments matter most.

Even a smaller shift helps. The same body of evidence reports that a 10% reduction from your current carbohydrate intake was linked, on average, to:

• a 0.11% drop in HbA1c (your three-month average blood sugar)
• a 0.12 mmol/L drop in triglycerides
• about 1.34 kg (roughly 3 lb) of weight loss

What about cholesterol and my arteries?

A common worry is that replacing bread with eggs and avocado will clog the arteries. The picture is more nuanced than either “yes” or “no.”

Research shows that low-carb diets tend to shift LDL particles from small and dense, which is linked to more plaque, toward larger and fluffier particles. The triglyceride-to-HDL ratio is also a useful marker: a ratio of 3.5 or lower is generally considered favorable.

Recent meta-analyses show that this ratio is a much better predictor of heart health and insulin resistance than your total cholesterol ever was.

Two cautions:

• LDL cholesterol can go up on a low-carb diet, particularly when saturated fat (butter, fatty meats, cream) is high. Prioritize unsaturated fats such as olive oil, nuts, avocado, and fish.
• No single ratio guarantees heart health. Recheck your full lipid panel with your clinician a few months after changing your diet.

Do I need to exercise?

In a 2026 subgroup analysis, blood sugar and triglycerides improved on the low-carb protocol even in people who did not exercise. That is encouraging if your schedule is tight. Exercise still improves heart health, mood, muscle, and long-term weight maintenance, so treat it as a bonus rather than an optional extra.

Why is it hard to stick with?

Headlines that say low-carb diets “fail” after 12 months often miss the reason. A 2024 study in the Journal of Diabetes Investigation described an “adherence gap”: the diet’s effects fade because people drift away from the plan, not because the biology stops working.

Two habits were linked to better adherence:

• Tracking: a simple food diary makes it easier to stay under your carb target.
• Professional support: regular check-ins with a dietitian or health coach add accountability.

Quick checklist

• Check with your prescriber first if you take diabetes medication.
• Aim for 44% of daily calories from carbs or less, or start with a 10% reduction from where you are now.
• Favor protein and unsaturated fats to stay full.
• Watch your triglyceride-to-HDL ratio and your full lipid panel, not LDL alone.
• Keep moving when you can: exercise adds benefits beyond these two markers.
• Keep a food diary and schedule regular check-ins.

You own the how

Turn this into meals: the NourishFix planner builds a week of Mediterranean-style meals and a shopping list.

Plan my week →

Published 12 October 2026 4 sources Editorial standards

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