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The Two Biggest Keto Diet Mistakes
Why so many people feel terrible in the first few weeks — and how to fix it
Not Eating Enough Fat
This is the most psychologically difficult hurdle for most people, and it is almost entirely cultural. Decades of "fat is bad" conditioning run deep. When people cut carbohydrates they instinctively reduce portion sizes and avoid fat — without replacing those calories with anything. The result is not a ketogenic diet. It is simply under-eating.
Without adequate fat, the body has no alternative fuel source to draw on. Energy crashes. Hunger becomes relentless. Mental clarity disappears. Most people at this point conclude that keto doesn't work for them — when in reality, they never quite started it.
"The brain and nervous system alone require a consistent supply of fuel. On a ketogenic diet, that fuel is ketones — made from fat. Without generous fat intake, the tank is simply empty."
The solution sounds almost too simple: eat more fat. Olive oil, butter, ghee, avocado, fatty fish, nuts, full-fat dairy. Not measured in cautious teaspoons — eaten until genuinely satisfied. Fat is not the enemy. On a ketogenic diet, it is the entire point.
Ignoring Electrolytes — Especially Sodium
This is the most common reason people experience what is widely called the keto flu — headaches, fatigue, brain fog, muscle cramps and a general feeling of depletion in the first one to two weeks. Most people interpret this as their body rejecting the diet. In most cases, it is simply a mineral deficit.
When carbohydrate intake falls, insulin levels drop rapidly. One of insulin's roles in the body is to signal the kidneys to retain sodium. With less insulin circulating, the kidneys excrete sodium at a much faster rate. Magnesium and potassium follow. The result is a depletion that creates real, measurable physical symptoms — not a sign that something is wrong, but a sign that mineral intake needs to increase.
"The keto flu is not the diet failing. It is a mineral deficit that is straightforward to correct — and once it is, most people feel considerably better than they did before."
The fix is equally straightforward: salt food generously, particularly in the first two to four weeks. Add a pinch of good-quality salt to water if needed. Magnesium glycinate in the evening supports sleep and reduces cramps. Potassium comes naturally from avocado, leafy greens and nuts — all compatible with a ketogenic approach.
An Ayurvedic Perspective
Both of these mistakes resonate strongly through an Ayurvedic lens. In the data gathered across 91 health food stores and at live events, the distribution of constitutional types was strikingly consistent:
Vata types — the majority of people seeking health solutions — are characterised by lightness, irregularity, and a tendency toward anxiety. They often eat erratically, skip meals, and are particularly susceptible to the depleted, ungrounded feeling that comes from under-eating or losing electrolytes quickly. Fat is one of the most deeply nourishing substances for Vata. Ghee has been used in Ayurveda for thousands of years precisely because of its grounding, stabilising quality. Telling a Vata type to eat more fat is not just good ketogenic advice — it is good Ayurvedic medicine.
Salt, too, is listed among the tastes that balance Vata. The depletion that comes from electrolyte loss is experienced most acutely by Vata constitutions — and it mirrors what Ayurveda would recognise as a Vata imbalance: dryness, lightness, instability, and nervous system disruption.
Both traditions, arriving from entirely different starting points, point to the same solution: ground the body, nourish the nervous system, and provide the fat and minerals it needs to function well.
The Practical Fix
Add More Fat
- Olive oil — dress everything generously
- Butter or ghee — cook with it freely
- Avocado — daily if possible
- Fatty fish — salmon, mackerel, sardines
- Nuts — almonds, walnuts, Brazil nuts
- Full-fat dairy if tolerated
Replenish Electrolytes
- Salt food generously — especially weeks 1–4
- Add a pinch of salt to water if needed
- Magnesium glycinate (evening) for sleep & cramps
- Potassium from avocado, spinach, nuts
- Bone broth — a natural electrolyte source
- Avoid plain water in large quantities
Most people who feel unwell in the first weeks of a ketogenic diet are not experiencing a reaction to the diet itself. They are experiencing the predictable consequence of under-fuelling and under-mineralising a body in transition. Address both, and the experience changes dramatically.