Keto Diet Guide

The ketogenic (keto) diet is a low-carb, high-fat way of eating that shifts your body to burn fat for fuel. If you want a clear starting point for the keto diet, this keto diet guide covers the rules that matter most, what to eat, what to skip, and simple ways to stay consistent.

What is the keto diet?

At its core, the ketogenic diet is a low-carb, high-fat eating plan designed to put your body into a metabolic state called ketosis. In ketosis, your body makes ketones and becomes more efficient at using fat for energy instead of relying on carbohydrates, which many people notice as steadier energy and fewer cravings.

The basic rules of keto

To succeed on keto, you'll need to stick to a few simple yet critical rules:

• Limit carbs to 20-50 grams per day.
• Consume moderate protein to support muscle mass without kicking you out of ketosis.
• Get 70-80% of your calories from fats - this is what fuels your body during ketosis.
• Stay hydrated - increased water loss is common on keto, so drink up.
• Replenish electrolytes as needed, especially sodium, potassium, and magnesium, to reduce headaches, fatigue, and cramping.

What can you eat (and not eat) on keto?

Knowing what you can and can't eat is key to staying in ketosis. On a keto diet, you'll want to focus on consuming high-fat, low-carb foods that keep your body in ketosis while providing essential nutrients.

Foods to enjoy:

• Meat and Poultry: Beef, chicken, pork - opt for fattier cuts where possible.
• Fatty Fish: Salmon, mackerel, and sardines are rich in healthy fats.
• Eggs: A keto staple packed with protein and healthy fats.
• High-Fat Dairy: Butter, cream, cheese, and full-fat yoghurt (always check the label of yoghurt as some can be high in sugar).
• Nuts and Seeds: Almonds, walnuts, chia, and flaxseeds (in moderation).
• Avocados: High in heart-healthy fats and very low in carbs.
• Low-carb vegetables: Leafy greens, broccoli, cauliflower, and zucchini.
• Healthy Oils: Olive oil, coconut oil, and avocado oil.

Foods to avoid:

• Grains and Starches: Bread, pasta, rice, and most baked goods.
• Sugar and Sweets: Candy, desserts, and sugary drinks.
• Most Fruits: Especially bananas, apples, and grapes (berries are okay in moderation).
• Beans and Legumes: Lentils, chickpeas, and black beans are too high in carbs.
• Root Vegetables: Potatoes, kumara, and carrots.
• Low-Fat Products: Avoid anything labelled as diet or low-fat - it is often higher in carbs and lower in satiety.
• Unhealthy Fats: Skip highly processed vegetable oils like canola or soybean oil where you can.
• Alcohol: Alcohol can disrupt ketosis, but some dry wines or spirits in moderation may be acceptable.

Can keto help you lose belly fat?

Absolutely. One of the biggest benefits of the keto diet is its ability to support overall fat loss, including around the belly. By reducing carb intake and using fat as your primary fuel source, your body can tap into stored body fat more easily, which may reduce visceral fat over time. However, while keto can support fat loss, you cannot choose where your body loses fat first.

How to structure your keto diet

Setting up a keto plan can seem overwhelming at first, but these five steps will keep you on track:

• Calculate Your Macros: Use an online keto calculator to determine your daily fat, protein, and carb needs based on your goals.
• Plan Your Meals: Focus on building each meal around high-fat proteins, low-carb veggies, and healthy fats like olive oil or avocado.
• Track Your Intake: Use a food-tracking app to stay within your carb limits and ensure you hit your macros.
• Stay Hydrated: Drinking plenty of water is essential - aim for at least eight glasses a day, as ketosis can lead to increased fluid loss.
• Consider Intermittent Fasting: Many keto enthusiasts combine their diet with intermittent fasting to support fat-burning and improve appetite control.

What supplements are helpful on keto?

While this diet can provide most of your nutritional needs, certain keto supplements can make the transition smoother and help you stay consistent:

Electrolytes: An electrolyte hydration supplement can be helpful because low carb eating reduces stored glycogen, which also lowers water and mineral retention. When sodium, potassium, and magnesium drop, you may feel fatigue, headaches, dizziness, or muscle cramps. Adding electrolytes can support hydration and nerve and muscle function while your body adapts to ketosis.

Magnesium: While it's part of electrolytes, a specific magnesium supplement can support muscle relaxation and sleep quality, and it may reduce cramping. Many people also find it useful if their keto food choices are light on magnesium-rich greens and nuts.

MCT Oil: Medium-chain triglycerides (MCTs) are fats that are quickly absorbed and converted into ketones, providing a quick energy boost and helping to maintain ketosis. Start small to avoid stomach upset, then increase gradually if it suits you.

Omega-3 Fatty Acids: Support heart health and help reduce inflammation, which can be useful if your fat intake increases and you want better balance from oily fish or fish oil.

Fibre Supplements: As keto can reduce fibre intake due to limited fruit and grain intake, a fibre supplement can support regularity and digestion. Pair it with extra fluids and low-carb vegetables for best results.

Always consult a healthcare professional before starting any new diet or supplement regimen, especially if you have pre-existing health conditions.

Frequently asked questions about the keto diet

How many carbs can you eat on the keto diet?

Most people aim for 20-50 grams of net carbs per day on the keto diet. The lower end is often easier for reaching ketosis quickly, but your personal tolerance can vary. Track your intake for a week and adjust based on your results and how you feel.

How long does it take to get into ketosis?

Many people reach ketosis within 2 to 4 days, but it can take longer depending on carb intake, activity, and individual metabolism. Keeping carbs consistently low and prioritising electrolytes can make the transition smoother. If you want confirmation, use urine strips early on or a blood ketone meter for more precise tracking.

What should you eat for breakfast on keto?

A keto breakfast usually combines protein and fat with very low carbs, like eggs cooked in butter with avocado or salmon. This helps keep you full and supports stable energy through the morning. If you are short on time, plain full-fat yoghurt with chia seeds and a few berries can also fit.

Can you lose belly fat with a keto diet?

Yes, a keto diet can support overall fat loss, which often includes reductions around the midsection over time. Lower carb intake can reduce appetite for some people and may improve blood sugar control, which helps consistency. Focus on a calorie deficit, adequate protein, and strength training for the best body composition results.

What is keto flu and how do you avoid it?

Keto flu is a set of short-term symptoms like fatigue, headache, and cramps that can happen as your body adapts to lower carbs. It is often linked to fluid and electrolyte losses as glycogen drops. Drinking more water and adding sodium, potassium, and magnesium can reduce or prevent these symptoms.

Do you need to track macros on keto?

You do not have to track macros forever, but tracking can help in the first few weeks. It makes it easier to stay within your carb limit and avoid accidentally overeating carbs from sauces, snacks, or drinks. Once your meals are consistent, many people switch to tracking only occasionally.

What are the best supplements for keto?

Electrolytes are often the most useful, especially early on, because they support hydration and reduce cramps and headaches. Magnesium can support sleep and muscle relaxation, while MCT oil can provide quick energy for some people. Choose supplements based on your symptoms and diet gaps, not just trends.