There may indeed be a connection between a long-term diet high in refined carbohydrates and increased musculoskeletal or joint pain. However, current evidence does not support the claim that everyone who eats a high-carbohydrate diet will develop joint pain. It also does not support the idea that the body routinely releases calcium from the bones primarily to “balance body fluids.”

The relationship is more accurately explained through several metabolic pathways.

1. Glycation Can Stiffen Collagen

Long-term elevations in blood glucose—especially frequent post-meal glucose spikes—promote the formation of advanced glycation end products, or AGEs.

AGEs can accumulate in the collagen of cartilage, tendons, ligaments, and joint capsules. This process may cause collagen fibers to become cross-linked, stiff, and less elastic. It may also increase oxidative stress and activate inflammatory pathways.

Research suggests that the accumulation of AGEs may reduce the ability of joint cartilage to produce proteoglycans and maintain or repair its extracellular matrix. PubMed study

As a result, patients may experience:

• Joint stiffness and reduced range of motion

• Frozen shoulder

• Trigger finger

• Carpal tunnel syndrome

• Tendon or plantar fascia pain

• Worsening of existing osteoarthritis symptoms

2. Insulin Resistance Promotes Chronic Inflammation

The problem is usually not carbohydrates alone. The greater concern is a dietary pattern dominated by refined starches, sweets, sugary beverages, and ultra-processed foods.

Repeated blood sugar spikes can contribute to insulin resistance and increased visceral fat. Visceral fat is metabolically active and releases inflammatory substances that may increase pain sensitivity and interfere with tissue recovery.

Therefore, pain may arise not only from structural wear and tear but also from a persistent, low-grade inflammatory environment.

3. Weight Gain Increases Pressure on the Joints

A high-calorie diet rich in refined carbohydrates may contribute to abdominal obesity and weight gain. This places additional mechanical pressure on weight-bearing joints, including the knees, hips, ankles, and feet.

At the same time, excess adipose tissue produces inflammatory signals. Joint pain can therefore result from a combination of:

• Increased mechanical stress

• Metabolic inflammation

• Reduced physical activity

• Impaired tissue recovery

4. Fructose May Increase Uric Acid

Large amounts of sugary drinks, fruit juice, and foods containing added fructose may raise uric acid levels. Elevated uric acid can increase the risk of gout and inflammatory joint pain.

A systematic review found that sugar-sweetened beverage consumption was associated with an increased risk of gout and hyperuricemia. PubMed systematic review

Does the Body Release Calcium From the Bones?

Blood calcium is tightly regulated. When calcium intake is insufficient, vitamin D deficiency is severe, kidney function is impaired, or parathyroid hormone is elevated, the body may increase bone resorption to help maintain blood calcium levels.

This means that a person can have normal blood calcium even while losing bone mineral.

However, eating a high-carbohydrate diet does not usually cause the body to release large amounts of calcium from the bones simply to balance body fluids. The more likely pathway is:

Excess refined carbohydrates and added sugar → blood glucose spikes and insulin resistance → glycation, inflammation, weight gain, and elevated uric acid → increased musculoskeletal and joint pain

Does a High-Carbohydrate Diet “Use Up” Vitamin D?

There is currently no strong evidence that carbohydrate metabolism directly consumes large amounts of vitamin D.

The relationship is more likely indirect:

• Refined carbohydrates may replace foods rich in vitamin D, calcium, magnesium, and protein.

• Obesity is frequently associated with lower circulating levels of 25-hydroxyvitamin D.

• People with limited outdoor activity may receive inadequate sunlight.

• Digestive disorders may reduce vitamin D absorption.

• Liver or kidney dysfunction may interfere with vitamin D activation.

• Certain medications may affect vitamin D metabolism.

• Ovo-vegetarian or vegan diets may provide insufficient vitamin D unless fortified foods or appropriate supplements are included.

Vitamin D helps the intestines absorb calcium and supports normal bone mineralization. True vitamin D deficiency can contribute to osteomalacia, diffuse bone pain, muscle weakness, and an increased risk of falls or fractures.

Vitamin D status should be evaluated with a blood test measuring 25-hydroxyvitamin D [25(OH)D], rather than diagnosed from joint pain alone. NIH Vitamin D information for health professionals

Laboratory Tests to Consider

For a patient with persistent bone, muscle, or joint pain, the following tests may be considered based on the clinical presentation:

• 25-hydroxyvitamin D

• Serum calcium and albumin, with corrected calcium when appropriate

• Phosphorus

• Magnesium

• Parathyroid hormone

• Hemoglobin A1c

• Fasting glucose and fasting insulin

• Uric acid

• Kidney function

• DXA bone-density testing when clinically indicated

Key Message

The relationship between a high-refined-carbohydrate diet and pain is more likely driven by glycation, chronic inflammation, insulin resistance, excess mechanical load, and elevated uric acid.

Calcium or vitamin D deficiency may coexist and may worsen bone or muscle pain, but these deficiencies should not automatically be assumed to be the primary cause of joint pain. Proper laboratory testing and clinical evaluation are important before recommending high-dose calcium or vitamin D supplementation.