- Low-carb, keto, fasting and GLP-1 users (e.g. Mounjaro®) lose sodium, potassium and magnesium more rapidly [1],[2].
- Electrolyte imbalance can cause “keto flu”, fatigue, headaches and light-headedness [2],[3].
- Balanced, zero-sugar electrolytes prevent dehydration and support energy, focus and muscle function [3],[4].
- Ultimate Electrolytes delivers 500 mg sodium, 500 mg potassium and 150 mg magnesium malate per serving — no sugar or fillers.
- Electrolyte Balance Capsules offer the same mineral profile in vegan capsule form, ideal for fasting or travel.
Whether you’re following a ketogenic diet, practising intermittent fasting, or using GLP-1 medication such as Mounjaro®, hydration takes on new importance. These approaches shift how your body stores glycogen, processes water and excretes minerals. Without proper electrolyte intake, it’s easy to feel flat, light-headed or unusually tired — even when you’re eating clean.
This guide explains why electrolyte loss is greater on keto and fasting plans, how GLP-1 drugs alter fluid balance, and how to stay hydrated with clean, sugar-free electrolyte support.
A Note from Ben, Founder of Love Life Supplements
When I first experimented with intermittent fasting, I made the same mistake most people do — I forgot about electrolytes. The fatigue and brain fog I felt weren’t hunger; they were mineral depletion. Once I added sodium, potassium and magnesium back in, everything changed.
That’s why we created Ultimate Electrolytes — a clean, zero-sugar blend with real Himalayan Pink Salt for sodium, matched 1:1 with potassium and 150 mg magnesium malate for energy. It supports hydration during fasting, keto, or use of medications that affect fluid balance. For fasting days, Electrolyte Balance Capsules are my go-to — pure minerals, nothing else.
Hydration isn’t just about water — it’s about balance. Get that right and your energy, focus and recovery will all follow.
Stay balanced, stay sharp,
Ben Law
Founder, Love Life Supplements
Why keto and fasting increase electrolyte loss
When you reduce carbohydrates, glycogen — your stored form of glucose — also decreases. Each gram of glycogen binds approximately three grams of water, so you excrete both water and sodium early in ketosis. This natural diuretic effect causes rapid weight changes but also flushes electrolytes like sodium, potassium and magnesium [1].
The result? Fatigue, headaches, muscle cramps and brain fog, often mistaken for “keto flu”. These symptoms aren’t inevitable — they’re simply signs of electrolyte imbalance.
How GLP-1 medications such as Mounjaro® affect hydration
GLP-1 receptor agonists (e.g. Mounjaro®, Ozempic®) slow digestion and suppress appetite, which can reduce food-derived mineral intake. They also increase fluid loss through mild gastrointestinal effects. Over time, this combination depletes electrolytes and contributes to weakness or dizziness [2].
Maintaining hydration with a zero-sugar electrolyte supplement is especially important for GLP-1 users who may struggle to consume adequate fluids or salt with food.
Key electrolytes that matter most
- Sodium — regulates extracellular fluid and nerve signalling. Low sodium causes dizziness and cognitive fog [3].
- Potassium — supports intracellular hydration and muscle contractions. Deficiency leads to cramps and irregular heartbeat [4].
- Magnesium — drives ATP energy production and reduces stress. Deficiency can worsen fatigue, sleep issues and muscle tension [5].
Symptoms of electrolyte imbalance on keto or fasting
- Fatigue, brain fog or poor focus
- Muscle cramps or twitches
- Dizziness or light-headedness when standing
- Increased heart rate or palpitations
- Headaches, especially in the morning
- Dry mouth or constant thirst despite drinking water
How to stay hydrated without breaking a fast
The key is replacing minerals, not calories. Sugar-laden sports drinks spike insulin and interrupt fasting, while clean electrolyte powders and capsules do not. Ultimate Electrolytes and Electrolyte Balance Capsules contain zero sugar or carbs, so you can take them freely during fasting windows.
- Morning: Mix one scoop of Ultimate Electrolytes in 500 ml of water to rehydrate after sleep.
- During fasting: Sip small amounts steadily to prevent dizziness or fatigue.
- Evening: If training or sauna use is part of your day, take a second serving post-session for recovery.
Electrolytes on keto: the “keto flu” fix
During the first week of ketosis, rapid sodium and water loss can cause headaches, cramps and nausea. Replenishing sodium (around 3–5 g daily) and potassium (1–2 g) significantly reduces these symptoms. Magnesium helps offset muscle tension and supports better sleep — both critical for keto adaptation [1],[4].
Ultimate Electrolytes provides 500 mg sodium, 500 mg potassium and 150 mg magnesium per serving — the perfect baseline for most people on low-carb or fasting routines.
Why sugar-free matters
Most commercial electrolyte drinks use sugar or maltodextrin to mask flavour and aid absorption. But in keto, fasting or GLP-1 use, sugar spikes insulin and interrupts fat metabolism. Studies show hydration efficiency comes primarily from mineral balance — not glucose concentration [5],[6].
That’s why the LLS electrolyte range is entirely sugar-free, flavoured naturally, and tested for purity — no unnecessary sweeteners or artificial dyes.
Stacking electrolytes for best results
For deeper recovery and energy support, combine electrolytes with:
- Creapure® Creatine Capsules — improves muscle hydration and performance.
- Magnesium Glycinate — supports relaxation and quality sleep during keto adaptation.
- Vitamin D3 + K2 — assists calcium metabolism, often impacted by low electrolyte intake.
FAQs
Can electrolytes break a fast?
No. Pure electrolytes contain no calories and won’t affect autophagy or fat-burning processes.
Why do I feel dizzy on keto or Mounjaro?
Rapid water and sodium loss cause lower blood pressure. Rehydration with sodium-rich electrolytes usually resolves this quickly [2],[3].
How much sodium and potassium do I need?
Most low-carb or fasting individuals benefit from 3–5 g sodium and 1–2 g potassium daily from food and supplements combined.
Are LLS electrolytes safe for daily use?
Yes. Both Ultimate Electrolytes and Electrolyte Balance Capsules are made under UK GMP and BRC certification and third-party tested for purity.
References
- [1] Phinney SD, Volek JS. The art and science of low carbohydrate living. Beyond Obesity LLC; 2011.
- [2] Wilding JPH, et al. GLP-1 receptor agonists in obesity and type 2 diabetes. N Engl J Med. 2021. PubMed
- [3] Popkin BM, et al. Water, hydration and health. Nutr Rev. 2010. PubMed
- [4] Volpe SL. Magnesium in exercise and sport. Curr Sports Med Rep. 2021. PubMed
- [5] Shirreffs SM, et al. Rehydration after exercise in the heat. Sports Med. 2003. PubMed
- [6] Sawka MN, et al. Exercise and fluid replacement. Med Sci Sports Exerc. 2016. PubMed
Accessed and current November 2025.
Hydration doesn’t require sugar — it requires precision. Balance sodium, potassium and magnesium daily to feel focused, energised and clear, whatever your nutrition plan.
👉 Shop Ultimate Electrolytes Powder
👉 Shop Electrolyte Balance Capsules
Ben Law is the founder of Love Life Supplements and host of the Optimised Health Show. He is a qualified Advanced Dietary Supplement Advisor and Primal Blueprint Certified Expert, helping thousands of UK customers optimise performance and recovery with transparent, research-led formulations manufactured under UK GMP and BRC standards. Learn more about Ben.