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A practical first-week guide - based on the DiRECT trial protocol (Lean et al., The Lancet, 2018).
A low-carbohydrate diet restricts total carbohydrate intake to 20–50 g per day (compared to the typical Western diet of 250–300 g/day). This lowers insulin levels, prompts the body to burn stored fat for fuel, and - in people with type 2 diabetes - can produce remission of the disease. The DiRECT trial demonstrated 46% remission at one year and 36% at two years in primary care patients with type 2 diabetes of up to 6 years' duration.
| Mineral | Why You Lose It | Best Food Sources | Supplementation | Caution |
|---|---|---|---|---|
| Sodium | Insulin lowers sodium reabsorption in the kidney. As insulin drops, sodium (and water) are excreted rapidly - causing headache, fatigue, and dizziness. | Salt your food generously. Broth or bouillon cubes. Pickles. | Add 1–2 g extra sodium per day in week 1. A cup of salted broth covers this. | If you are on a diuretic or have heart failure, discuss sodium intake with your physician before starting. |
| Potassium | Lost alongside sodium via the kidneys. Low potassium causes muscle cramps, weakness, and heart palpitations. | Avocado (975 mg each), leafy greens, salmon, mushrooms, nuts. | Focus on food sources. Supplement only if dietary intake is inadequate. | Do not supplement potassium if you are on ACE inhibitors, ARBs, or potassium-sparing diuretics without physician guidance. |
| Magnesium | Magnesium is involved in over 300 enzymatic reactions. Deficiency causes muscle cramps, poor sleep, constipation, and anxiety. | Dark leafy greens, nuts (especially almonds), dark chocolate (85%+), avocado. | 200–400 mg magnesium glycinate or citrate at bedtime. Avoid magnesium oxide (poor absorption). | - |
| Symptom | Cause | What to Do | Typical Duration |
|---|---|---|---|
| Headache | Sodium and water loss from reduced insulin | Drink salted broth. Increase sodium intake. | Days 2–5 |
| Fatigue / Brain fog | Glucose withdrawal; brain adapting to ketones | Rest. Ensure adequate sodium. Fat adaptation takes 2–4 weeks. | Days 2–7 |
| Muscle cramps | Electrolyte loss (sodium, potassium, magnesium) | Increase electrolyte intake. Magnesium at bedtime. | Days 3–10 |
| Irritability | Blood glucose fluctuations during adaptation | Eat enough fat and protein. Do not restrict calories. | Days 2–5 |
| Constipation | Reduced fibre if vegetables are not emphasised; dehydration | Eat more non-starchy vegetables. Drink more water. Magnesium citrate. | Week 1–2 |
| Heart palpitations | Electrolyte imbalance, especially potassium | Increase potassium-rich foods. Check electrolytes if persistent. | Days 3–7 |
| Increased urination | Glycogen depletion releases stored water; reduced insulin reduces renal sodium retention | Normal and expected. Replace fluids and electrolytes. | Days 1–5 |
| Breakfast | Lunch | Dinner | Snack | |
|---|---|---|---|---|
| Day 1–2 | 3 scrambled eggs in butter + avocado | Tuna salad (olive oil, celery, cucumber) on lettuce leaves | Grilled salmon + roasted broccoli in olive oil | Handful of macadamia nuts |
| Day 3–4 | Full-fat Greek yoghurt (plain) + handful of berries + walnuts | Chicken thighs + large green salad with olive oil dressing | Beef burger (no bun) + sautéed mushrooms and spinach in butter | Hard-boiled eggs + celery sticks |
| Day 5–7 | Bacon + eggs + sautéed greens | Sardines on cucumber slices + avocado | Lamb chops + cauliflower mash (butter + cream) + green beans | Cheese + olives |
If you take insulin, sulfonylureas (glipizide, glimepiride, glyburide), SGLT-2 inhibitors (empagliflozin, dapagliflozin), or blood pressure medications, your doses may need to be reduced within days of starting a low-carbohydrate diet. Blood glucose and blood pressure can fall rapidly. Contact your physician before starting and monitor closely in the first week. Do not adjust medications without guidance.