<130g
Carbs/day (general low carb)
2–3×
Faster initial weight loss vs low fat
20–50g
Carbs/day for keto

What Is a Low Carb Diet?

A low carb diet limits carbohydrates — primarily from grains, starchy vegetables, and fruit — and replaces them with protein and fat. Most low carb diets cap carbs at under 130g per day. Ketogenic diets are an extreme form, limiting carbs to 20–50g/day to trigger ketosis.

There's no single definition: "low carb" is a spectrum. You can go moderately low (100–130g/day), very low (50–100g/day), or ketogenic (<50g/day). Most beginners do best starting at 100–130g/day and adjusting from there.

Key principle: When you eat fewer carbs, your body depletes glycogen stores and shifts to burning fat for fuel. This metabolic switch drives most of the weight loss benefits.

What the Science Says

Low carb diets have more RCT evidence behind them than almost any other diet approach. Here's what the research actually shows:

OutcomeLow CarbLow FatEvidence
6-month weight loss~5–8 kg~3–5 kgShai et al. 2008, NEJM
2-year weight lossSimilarSimilarSacks et al. 2009, NEJM
Triglycerides↓↓ Significant drop↓ Modest dropMultiple RCTs
HDL cholesterol↑ Increases→ No changeVolek et al. 2004
Blood sugar control↓↓ Strong improvement↓ ModestWestman et al. 2008
Hunger/satiety✅ Better satiety❌ More hungerJohnstone et al. 2008

Bottom line: low carb wins in the short term — especially for blood sugar and triglycerides. Long-term weight loss is similar to other diets if you stick to it. Adherence is the real predictor of results.

Weight Loss Over 12 Months (kg) — Low Carb vs Low Fat 3 mo 6 mo 9 mo 12 mo 0 2 4 6 8 Low Carb Low Fat

What to Eat on a Low Carb Diet

Focus on whole, minimally processed foods that are naturally low in carbohydrates:

✅ Protein

Meat & Fish

Chicken, beef, pork, salmon, tuna, sardines, shrimp — unlimited

✅ Fat

Eggs & Dairy

Eggs, butter, cheese, Greek yogurt, heavy cream, cottage cheese

✅ Vegetables

Non-Starchy Veg

Spinach, broccoli, zucchini, cauliflower, kale, peppers, cucumber

✅ Healthy Fat

Nuts & Oils

Avocado, olive oil, almonds, walnuts, coconut oil, nut butters

✅ Moderate

Berries

Strawberries, blueberries, raspberries — small portions OK

✅ Drinks

Beverages

Water, sparkling water, coffee, tea, bone broth — no sugar

What to Avoid

❌ Grains

Bread & Pasta

White bread, pasta, rice, oats, cereal, crackers, tortillas

❌ Sugar

Sweets & Soda

Candy, cookies, cakes, juice, soda, sports drinks, most sauces

❌ Starchy

Starchy Vegetables

Potatoes, corn, peas, butternut squash, parsnips, beets

❌ Fruit

High-Sugar Fruits

Bananas, grapes, mangoes, pineapple, apples in large amounts

❌ Legumes

Beans & Lentils

Black beans, chickpeas, lentils, kidney beans (keto only)

❌ Alcohol

Beer & Sweet Drinks

Beer, wine (most), cocktails with juice or soda, hard cider

Free 7-Day Low Carb Meal Plan

Each day averages ~1,500 calories, ~100g protein, and under 80g net carbs. Adjust portions for your goals.

Monday
Breakfast: 3-egg omelette with spinach, feta & olive oil (350 kcal, 6g carbs)
Lunch: Grilled chicken salad with avocado, cucumber & olive oil dressing (420 kcal, 8g carbs)
Dinner: Salmon fillet with roasted broccoli & butter (480 kcal, 10g carbs)
Snack: 20 almonds + string cheese (200 kcal, 4g carbs)
Tuesday
Breakfast: Greek yogurt (full-fat) with walnuts & raspberries (320 kcal, 14g carbs)
Lunch: Tuna lettuce wraps with mayo, celery & mustard (380 kcal, 6g carbs)
Dinner: Ground beef stir-fry with zucchini, peppers & soy sauce (520 kcal, 12g carbs)
Snack: Hard-boiled eggs × 2 (160 kcal, 1g carbs)
Wednesday
Breakfast: Scrambled eggs with bacon & avocado (400 kcal, 5g carbs)
Lunch: Cauliflower fried rice with chicken & egg (430 kcal, 14g carbs)
Dinner: Pork tenderloin with green beans & garlic butter (490 kcal, 10g carbs)
Snack: Celery sticks with almond butter (170 kcal, 6g carbs)
Thursday
Breakfast: Cottage cheese with strawberries & chia seeds (290 kcal, 13g carbs)
Lunch: BLT salad (bacon, lettuce, tomato, cheddar, ranch) (410 kcal, 8g carbs)
Dinner: Shrimp with cauliflower mash & asparagus (460 kcal, 15g carbs)
Snack: Cheese slices + deli turkey (190 kcal, 2g carbs)
Friday
Breakfast: 2-egg veggie scramble with mushrooms, onion & cheese (350 kcal, 8g carbs)
Lunch: Steak salad with arugula, parmesan & lemon vinaigrette (480 kcal, 6g carbs)
Dinner: Baked chicken thighs with roasted zucchini & cherry tomatoes (500 kcal, 9g carbs)
Snack: Mixed nuts (180 kcal, 5g carbs)
Saturday
Breakfast: Keto pancakes (almond flour, egg, cream cheese) with butter (370 kcal, 8g carbs)
Lunch: Turkey & cheese roll-ups with guacamole & cucumber (390 kcal, 9g carbs)
Dinner: Grilled ribeye with sautéed spinach & mushrooms (560 kcal, 7g carbs)
Snack: Pork rinds + hot sauce (110 kcal, 0g carbs)
Sunday
Breakfast: Full English low carb: eggs, bacon, sausage & tomato (450 kcal, 6g carbs)
Lunch: Egg salad lettuce wraps with dijon & chives (360 kcal, 5g carbs)
Dinner: Herb-crusted salmon with broccoli & lemon butter (490 kcal, 8g carbs)
Snack: Dark chocolate (85%) square + walnuts (200 kcal, 6g carbs)

Side Effects & How to Beat Them

The first 3–7 days can be rough. Here's what to expect and exactly how to handle it:

Side EffectWhy It HappensFix
Headache / brain fogElectrolyte loss as glycogen depletesAdd salt to food, drink bone broth, magnesium supplement
Fatigue / low energyBody adapting to fat burning (takes 2–4 weeks)Be patient, reduce workout intensity temporarily
Muscle crampsLow potassium and magnesiumEat avocado, leafy greens, take magnesium glycinate
ConstipationLess fiber from grainsEat more non-starchy veg, chia seeds, drink more water
Bad breathKetone production (acetone)Drink more water, chew gum (sugar-free), it fades
Cravings for carbsNormal first 2 weeks, then dramatically reducesEat enough fat and protein — don't under-eat
Electrolyte tip: Aim for 3–5g sodium, 1g potassium, and 300–500mg magnesium daily, especially in the first two weeks. This alone eliminates most "low carb flu" symptoms.

7 Beginner Tips That Actually Work

  • Don't drop calories too fast. Focus on cutting carbs first, not slashing calories. Eat until satisfied.
  • Read nutrition labels. Sugar hides in sauces, dressings, yogurt, and "healthy" snacks. Check every label.
  • Meal prep on Sundays. Cook proteins in bulk. When food is ready, you won't reach for carbs out of convenience.
  • Track net carbs, not total carbs. Net carbs = total carbs minus fiber. This matters for vegetables.
  • Keep go-to snacks stocked. Hard-boiled eggs, cheese, almonds, and deli meat prevent off-plan eating.
  • Don't fear fat. Fat keeps you full and makes the diet sustainable. Avoiding fat on low carb leads to misery.
  • Give it at least 4 weeks. Most people feel dramatically better after week 2. The first week is the hardest.

Frequently Asked Questions

How quickly will I lose weight on low carb?
Most people lose 1–3 kg in week 1 (mostly water weight from glycogen depletion). After that, expect 0.5–1 kg/week if you're in a calorie deficit. Fat loss is about 0.5kg/week on average.
Do I have to count calories on a low carb diet?
Not necessarily. Many people naturally eat less because protein and fat are more satiating. But if you're not losing weight after 3–4 weeks, tracking calories is a useful next step. Most women lose on 1,400–1,600 kcal/day, most men on 1,600–2,000 kcal/day.
Can I exercise on a low carb diet?
Yes — but expect reduced performance in the first 2–4 weeks while your body adapts. Endurance and strength usually return to normal after "keto-adaptation." For high-intensity training, some athletes add carbs around workouts (targeted ketogenic diet).
Is low carb safe long term?
Studies up to 2 years show it's safe for most people. Those with type 2 diabetes, kidney disease, or who are pregnant should consult a doctor first. As long as you eat vegetables, adequate fiber, and varied protein sources, low carb is nutritionally complete.
What's the difference between low carb and keto?
Keto is a stricter form of low carb: under 50g net carbs/day (sometimes under 20g) to trigger ketosis. General low carb allows 50–130g/day. Keto produces more dramatic initial results but is harder to maintain. Most beginners do better starting with general low carb.