The Short Answer

Most people eating a standard American diet are overly acidic, which promotes inflammation and chronic disease. You can shift your body toward a more alkaline state by eating more leafy greens and vegetables while reducing processed foods, sugar, and excess caffeine. Urine pH testing (7.2–7.8 is optimal) is the most reliable way to track your progress.

Body pH and autoimmune disease: Why alkalinity matters

The average American diet—high in processed foods and low in vegetables—pushes your body into an acidic state. When your body is overly acidic, your cells struggle to function properly, and inflammation accelerates.

Being overly acidic increases your risk for obesity, diabetes, heart disease, chronic pain, and autoimmune conditions. People with autoimmune diseases, including those managing Hashimoto’s low thyroid, lupus, or rheumatoid arthritis, often find that acidity worsens inflammation and flares.

The encouraging news is that you can nudge your body toward alkalinity through diet. You don’t need to overhaul everything overnight; small dietary shifts can make a significant difference.

Common signs you might be too acidic

Most people don’t realize their body is too acidic. Watch for these warning signs:

Swelling and bloating

Frequent urination

Brain fog and poor concentration

Salt cravings

Muscle cramps or twitches

Constipation

Reduced exercise endurance

Difficulty holding your breath

Rapid, shallow breathing

Disrupted sleep

If several of these symptoms resonate with you, testing may help clarify whether acidity is contributing to your health challenges.

How to accurately test your body’s pH

Different pH tests give different results, and not all are equally reliable.

Salivary pH tests are popular but lack solid scientific support. Blood pH testing is also unreliable because your body tightly regulates blood pH; it only fluctuates during acute events like poisoning or severe kidney or lung disease. However, a functional medicine blood panel can be useful: looking at CO2 and anion gap markers can reveal patterns of over-acidity.

Urine pH testing is the most accurate method. It reflects how acidic your system actually is and lets you track whether dietary changes are working. Optimal urinary pH should fall between 7.2 and 7.8. Keep in mind that infections, bacterial overgrowth, dehydration, and other factors can skew results, so test under consistent conditions.

Dietary shifts that promote alkalinity

The standard American diet (SAD) is acidifying. These habits push your body toward excess acidity:

Refined sugars and processed starches

Industrialized seed oils

Junk foods and fast food

Excess caffeine and sodas

Alcohol

Too much meat without balancing vegetables

Insufficient vegetables and whole fruits

To shift toward alkalinity, build your diet around leafy greens, colorful vegetables, and fruits. An alkaline diet is naturally rich in magnesium, potassium, calcium, and other minerals your cells need.

You don’t have to become a vegetarian or vegan. You simply need vegetables and fruits to be the foundation of your meals. A plant-rich diet also supports healthy gut bacteria, which strengthens immune function, particularly important for anyone managing autoimmune conditions.

Don’t confuse stomach acid with systemic acidity

Your stomach should be strongly acidic. Stomach acid is essential for digesting proteins and neutralizing pathogens. Ironically, insufficient stomach acidity often causes acid reflux symptoms.

If you struggle with reflux and don’t have ulcers, supplemental hydrochloric acid can help restore healthy stomach pH. Avoid bicarbonate-based antacid medications, which suppress the acid your body actually needs.

Health conditions that increase systemic acidity

While over-acidity promotes poor health, certain conditions can trigger it: anemia, asthma, low blood sugar (hypoglycemia), and insulin resistance or diabetes.

Severe acidity becomes dangerous. Conditions like diabetes, kidney disease, and lung disease can cause life-threatening acidity levels that require immediate medical attention.