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7 Signs that You Are in Ketosis

When you first start following a keto diet, it will take you a couple of days to enter into the state of ketosis. Depending on your activity level and on your metabolism, this usually takes 2 to 4 days to achieve.

How do you know that you’re in ketosis, though? There are a few signs and symptoms that you might experience, which will definitely help you to figure it out.

If you don’t want to measure your ketones level and spend money on Ketostix and similar products, you can rely on these symptoms to tell if you are in ketosis:

#1. Rapid weight loss

One of the first signs of ketosis is the rapid weight loss that you will experience in the first couple of days. It usually varies from 3 to 8 lbs and most of it will be water weight. Nevertheless, it’s still a very encouraging way to begin your keto journey.

Glycogen is how your body stores the extra energy from glucose, and each gram of glycogen is bound to 3 to 4 grams of water. This is why, as glycogen stores in your muscles, liver and fat cells get depleted, a lot of water will come off (1).

Because of the diuretic effect of the keto diet, you need to stay properly hydrated and make sure that you have your electrolytes in check.

After the initial period of rapid weight loss, you will continue using your fat stores and will be now losing body fat.

#2. Decreased hunger

When your body switches to using fat as its primary fuel source (instead of glucose) it is normal to experience a significant loss of appetite, which will probably last for a while.

The reasons for this are not completely clear yet, but a lot of people report a diminished sense of hunger on a keto diet, which is indeed one of the reasons why it is so easy to stick to it and achieve great results.

Calories still matter and you will need to be in a caloric deficit in order to lose weight, but it becomes much easier to eat less.

The way you experience hunger will also become different – you will no longer feel ravenous if you haven’t eaten for a couple of hours, but will gradually become aware of the need to eat something, which is a much more pleasant feeling.

#3. Digestive issues

Whenever you are making changes to your diet, your GI tract needs to adapt to the new foods that you are now consuming, and to the different proportions of macronutrients.

Depending on how drastic the change is, this might result in temporary constipation or diarrhea, and this usually resolves in a matter of a week or two.

If you’re experiencing such problems, consuming food that is rich in fiber (such as green vegetables) will usually help you resolve them.

#4. Mental clarity and improved energy levels

One of the great things about switching to a keto diet is the increased energy that most people experience with it.

The reason behind this is that your blood sugar levels become much more stable, so you don’t experience glucose spikes and crashes, nor the sluggishness and fatigue that accompany them.

Instead, your energy is more or less constant during the day. Your mind will also feel much clearer, as the carb-induced brain fog will now be gone, and the keto diet has multiple benefits related to brain health (2, 3).

It’s amazing what limiting carbs can do to our minds!

#5. Insomnia

Unfortunately, for some people, the increased energy comes hand in hand with insomnia. Fear not, it doesn’t affect everyone and it is only temporary, until your body and mind learn how to deal with the extra energy they get from burning fat.

If you’re experiencing insomnia, make sure that you are well-hydrated and have your electrolytes in check, and try to limit the sources of blue light in the evening (i.e. lay down your mobile devices a 2-3 hours before bedtime and try not to use your computer in the evening).

A lot of people report great results with either taking a hot bath or shower, so you might want to try that. To help your body with the transition, you can take melatonin for the first couple of days, however, we recommend using it only for a limited amount of time, as your adrenal gland might start producing less of it if you use it on a regular basis.

#6. Dry mouth and bad breath

Another symptom of ketosis that can be rather unpleasant is dryness in your mouth, sometimes accompanied by a slight metallic taste and an acetone breath (the so-called “keto breath”) (4).

These symptoms usually resolve after a couple of days, so don’t be discouraged.

Unfortunately, the keto breath is the last to go, but you can try brushing your teeth more often and stock up on sugar-free gum (always check the label for carbs, though). Mint tabs can also be a good solution.

#7. Dizziness & fatigue

Ah, the dreaded keto flu! As your body switches from using glucose to using fat, it needs some time to adapt and become fully efficient at it.

The whole adaptation process usually takes a couple of weeks, however the fatigue you might experience in the beginning will resolve much quicker than that.

Remember that water will be flushed out of your system much more rapidly on a keto diet, which means that you will also be losing a lot of electrolytes. This is why it is so important to make sure that you’re having enough of them. If you don’t, you might experience fatigue, rapid heart rate, and dizziness.

The electrolytes you need to keep an eye on are salt, potassium, and magnesium. In fact, with proper electrolyte supplementation, you might not even experience the keto flu at all.

Keep in mind that every person is different. Our bodies adapt differently to change, and the adaptation process will also depend on your diet before you switched to keto.

Not everyone experiences all of the above symptoms; in fact, most people experience only a few of them.

The most frequent ones are water weight loss and decreased appetite, and some level of fatigue is also experienced by most people when first switching to a keto lifestyle.

Next: Signs You Are Fat Adapted

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