Manage blood sugar

TL;DR. Blood sugar is the number with the biggest downstream reach in modern disease. High blood sugar means high insulin, and years of high insulin drive type 2 diabetes, fatty liver, high blood pressure, PCOS, and a long list of cancers. The DiRECT trial in 2018 put nearly 9 in 10 people with early type 2 diabetes into remission in 8 weeks. Fructose, refined grains, and pure liquid sugar push the cascade hardest. Fiber, protein, and fat slow it down. If you already have a diagnosis, work with a Registered Dietitian.

What this goal does

This goal flags foods that push blood sugar and insulin hard, and rewards foods that slow the rise. Carbs are fine. The job is to keep your fasting insulin, fasting glucose, and HbA1c (a 3-month average) in a range that does not feed the cascade. Most people pair this with Lower added sugar.

Evidence

Gerald Reaven named the pattern in his 1988 Banting Lecture as Syndrome X. We now call it metabolic syndrome: insulin resistance, high insulin, rising blood sugar, high blood pressure, low HDL, high triglycerides, belly fat. One broken signal driving six symptoms. A high carb load drives high insulin. Over years, cells stop responding. The pancreas pushes harder, then falls behind. By the time a doctor calls it type 2 diabetes, the slide has run for a decade or two. Casey Means in Good Energy argues this is bio-observable: fasting insulin, HbA1c, the triglyceride-to-HDL ratio, and a continuous glucose monitor show the cascade years before a standard panel does.

Remission is on the table. The DiRECT trial (Lean et al., The Lancet 2018) put 149 UK primary-care patients with early type 2 diabetes on an 825-calorie liquid diet for 8 to 12 weeks. 46 percent were in remission at one year, 36 percent at two years, and 86 percent of those who lost 15 kg or more were in remission at one year. The Newcastle work before it (Lim 2011) showed the mechanism: fast loss of liver and pancreas fat restored beta-cell function. Krause Ch 30 treats this as standard medical nutrition therapy, and the 2019 ADA Consensus Report accepted low-carb as an evidence-supported option.

Lustig (Metabolical) lays out the food side: glucose goes everywhere; fructose mostly goes to the liver. It enters liver cells without insulin, skips the main brake in the sugar-burning pathway, and what the liver cannot burn it turns into fat. That fat is the seed of fatty liver disease (NAFLD, now called MASLD) and spills into the blood as triglycerides. Fructose also drives uric acid, which raises blood pressure and feeds gout. Blood sugar control is a fructose problem as much as a glucose problem.

Glycemic load, dampeners, and the high-fiber Pop-Tart problem

Glycemic index (GI) ranks a food by how fast its carbs raise blood sugar. Glycemic load (GL) is GI times the grams of carbs in a serving. GL is the number that matters. Watermelon is high GI but low GL. A bagel is moderate GI and high GL because it is a brick of refined flour. Under 10 is low, 20 or higher is high.

Three things slow the rise after a meal: fiber, protein, and fat. Food companies have learned to game this. A "high-fiber" Pop-Tart or "protein" candy bar uses isolated chicory fiber or soy protein sprayed onto a refined-flour base. The label scores well; your blood does not. Real oats with berries and Greek yogurt is a different food from corn flakes with skim milk, even at the same calorie count.

What helps

• Whole intact grains: steel-cut oats, barley, quinoa, brown rice, farro.
• Legumes: lentils, black beans, chickpeas. High fiber, high protein, low GL.
• Non-starchy vegetables: broccoli, spinach, peppers, mushrooms, zucchini.
• Whole fruit. Berries first, then apples, pears, citrus.
• Protein at every meal: eggs, fish, chicken, Greek yogurt, tofu, beans.
• Healthy fats: olive oil, avocado, nuts, seeds, fatty fish.

What hurts

• Pure liquid sugar: soda, sports drinks, sweet coffee, energy drinks, fruit juice.
• Refined grains: white bread, white rice, refined-flour pasta, most cereal, bagels.
• Anything with fructose, HFCS, or agave in the top 3 ingredients.
• Sweetened "healthy" snacks: Cliff Bars, most granola bars, protein bars, flavored yogurt.
• Big carb loads with no dampener: refined pasta with sauce, no protein, no salad.

How the scanner uses this

The scanner reads the Nutrition Facts panel and the ingredient list, and estimates glycemic load from carbs, fiber, and ingredient context.

Hard rules. A product fails if any is true.

• More than 25 g of added sugar per serving.
• Pure liquid sugar (sweetened drinks, juice, sports drinks, sweet coffee).
• Fructose, high-fructose corn syrup, or agave in the top 3 ingredients.

Soft rules. A product gets a warning if any is true.

• Estimated glycemic load above 20 per serving.
• Refined grain as the first ingredient.
• Net carbs above 25 g per serving with no dampener.

Bonuses. A product gets a boost if any is true.

• Estimated GL under 10 per serving.
• Fiber of 5 g or more per serving.
• Intact whole grain as the first ingredient.
• Protein of 10 g or more per serving.
• Healthy fats (olive oil, nuts, seeds, avocado, fatty fish).

Whole fruit, plain dairy, and starchy vegetables are scored on their real glycemic profile, not raw sugar grams. A whole apple is low-GL with 19 g of natural sugar. Apple juice is high-GL with the same sugar.

Worked examples

• Coca-Cola, 12 oz can. 39 g added sugar, liquid sugar, sugar second on the label. Three hard-rule failures. Block.
• Tropicana OJ, 8 oz. 22 g sugar, no fiber, fructose load close to a Coke. Hard-rule failure.
• Steel-cut oats, 1/4 cup dry. 4 g fiber, intact whole grain, low GL. Bonus.
• Whole apple. 4 g fiber, low GL with 19 g natural sugar. Bonus.
• Cooked lentils, 1 cup. 16 g fiber, 18 g protein, low GL. Bonus.
• White bread, 2 slices. Refined flour, GL around 20, 2 g fiber. Soft warning.
• Cliff Bar, Chocolate Chip. 17 g added sugar, cane syrup first. Soft warning.
• Plain Greek yogurt, 6 oz. 0 g added sugar, 17 g protein. Bonus.
• Grilled chicken with roasted vegetables. Protein, fiber, healthy fat, near-zero GL. Bonus.
• Refined-flour pasta with marinara, 2 cups. GL above 20, no dampener. Soft warning. Add protein and a salad to flip it.

A note on diagnosis (YMYL)

This page is education. If you have prediabetes, type 2 diabetes, gestational diabetes, type 1 diabetes, fatty liver, or PCOS, you need a Registered Dietitian Nutritionist (RDN). For diabetes, look for the CDCES credential. They write a plan that fits your medications and labs. Do not change your insulin or other diabetes medication on your own. Cutting carbs while keeping a high insulin dose can drive blood sugar dangerously low. See clinical nutrition by condition for the full picture.

Related reading

• Sugar — the clearest case. The long-form story of fructose, the insulin cascade, glycation, and the industry capture that delayed the science for 40 years.
• Clinical nutrition by condition. What changes once you have a diagnosis.
• Lower added sugar. The matching ingredient-level goal.

Sources

1. Mahan, L. K., and Raymond, J. L. (eds.) Krause's Food and the Nutrition Care Process (16e). Chapter 30 — medical nutrition therapy for type 2 diabetes.
2. Lustig, R. Metabolical (2021) — fructose as hepatic ethanol; de novo lipogenesis; the fatty-liver epidemic in children.
3. Means, C. Good Energy (2024) — metabolic dysfunction as bio-observable; fasting insulin, triglyceride-to-HDL ratio, continuous glucose.
4. Reaven, G. M. "Role of Insulin Resistance in Human Disease." 1988 Banting Lecture, Diabetes 37: 1595-1607.
5. Lean, M. E. J., et al. "Primary care-led weight management for remission of type 2 diabetes (DiRECT): an open-label, cluster-randomised trial." The Lancet 391: 541-551 (2018).
6. Lim, E. L., et al. "Reversal of type 2 diabetes: normalisation of beta cell function in association with decreased pancreas and liver triacylglycerol." Diabetologia 54: 2506-2514 (2011).
7. Evert, A. B., et al. "Nutrition Therapy for Adults With Diabetes or Prediabetes: A Consensus Report." Diabetes Care 42: 731-754 (2019).