You probably know keto means cutting carbs. But a few lesser-known facts explain why some people do well on keto and others give up after a week. Here are five worth knowing.

1. Your brain can run on ketones

Your brain normally uses glucose for energy. When carbs are very low, it can get a large part of its energy from ketones made by the liver. This switch takes a few days to a few weeks, which is one reason the first week of keto can feel hard.

2. Carbs hide in places you don't expect

Bread and pasta are obvious. Less obvious sources include:

• Sauces and dressings (ketchup, BBQ sauce, many salad dressings).
• Flavored yogurts and "low-fat" products, which often add sugar.
• Some supplements and gummies, which use sugar for taste and texture.

The fix is simple: read the Nutrition Facts or Supplement Facts panel and count total carbs minus fiber.

3. Protein still matters, but too much is not the goal

Keto is high fat and low carb, with a moderate amount of protein. Protein helps you keep muscle while losing weight, so skipping it is a mistake. Most keto plans build meals around eggs, fish, meat or tofu, then add vegetables and healthy fats.

4. Electrolytes are the secret to feeling good

When you cut carbs, your body releases water, and sodium, potassium and magnesium go with it. Low electrolytes are a common cause of the tiredness, cramps and headaches people call the "keto flu." Broth, leafy greens, avocado, nuts and a little extra salt on food help many people.

5. Consistency beats perfection

Keto works through steady habits, not a perfect single day. Simple routines make it easier: planning meals ahead, keeping keto-friendly snacks at home, and building small daily habits. Some people add a daily apple cider vinegar gummy before meals as part of that routine because it is easier to stick with than a shot of liquid vinegar. See gummies vs capsules vs drops to choose a form you will actually take.

The bottom line

Understanding how keto changes your body makes it much easier to stick with. If you have a health condition or take medication, check with your doctor before starting a new diet or supplement.