Why GLP-1 therapy depletes your electrolytes — and what to do about it.

Where electrolytes come from

Electrolytes — sodium, potassium, magnesium, and chloride — are not produced by the body. They come almost entirely from food and drink. When food intake drops 40–60% on GLP-1 therapy, electrolyte intake drops proportionally.

The symptoms of electrolyte deficiency overlap almost perfectly with commonly reported GLP-1 side effects:

• Fatigue and low energy
• Headaches
• Brain fog and difficulty concentrating
• Muscle cramps, especially at night
• Dizziness when standing
• Heart palpitations

This overlap means that people often reduce their dose or discontinue therapy due to symptoms that could be resolved with electrolyte supplementation — not a medication change.

Sodium: the most underrated gap

The average American gets 3,400mg of sodium daily — mostly from processed and prepared foods. On a significantly reduced intake diet, sodium consumption can fall to under 1,000mg daily without any deliberate low-sodium choices. The body uses sodium to regulate fluid balance, nerve signals, and blood pressure. A drop from 3,400 to under 1,000mg creates the constellation of symptoms above within days.

This is why many GLP-1 users report feeling dramatically better after something as simple as a salty snack or a broth-based soup — they're incidentally replacing depleted sodium.

Potassium and magnesium: the less obvious gaps

Potassium primarily comes from fruits, vegetables, dairy, and legumes. Magnesium comes from nuts, seeds, whole grains, and leafy greens. Both are foods that tend to be eaten in smaller amounts on a reduced-appetite diet, and both are critical for muscle function, nerve transmission, and sleep quality.

Magnesium deficiency in particular is associated with poor sleep, muscle cramps, and anxiety — all reported by a subset of GLP-1 users and almost never attributed to the actual cause.

What adequate electrolyte intake looks like

General daily targets for adults, which become harder to hit on reduced food intake:

• Sodium: 1,500–2,300mg
• Potassium: 2,600–3,400mg
• Magnesium: 310–420mg

Getting these from food alone while eating significantly less requires intentional planning — prioritizing electrolyte-dense foods at every meal. For most people on GLP-1 therapy, supplementing at least part of this is the more realistic path.