Bad breath Weight loss Increased ketones in the blood Increased ketones in breath or urine appetite suppression More focus and energy Short-term fatigue Short-term declines in performance Digestive problems Insomnia Many people on keto and similar diets, such as the Atkins diet, report that their breath has an unusual, fruity odor.
Bad breath is actually a common side effect of achieving full ketosis.
High ketone levels cause bad breath. The specific culprit is acetone, a ketone that leaves the body and is found in your urine and breath.
While this breath might be less than ideal for your social life, it could be a positive sign for your diet. Brushing your teeth several times a day or using sugar-free gum might solve the problem.
If you're using other alternatives like gum or sugar-free drinks, check the nutrition label for carbohydrates. These products can raise your blood sugar levels and lower your ketone levels.
Keto diets, along with other low-carbohydrate diets, are quite effective for weight loss.
As many weight loss studies have shown, switching to the keto diet will likely result in both short-term and long-term weight loss.
Rapid weight loss can occur during the first week. While some people believe this is fat loss, it is primarily water weight.
After the initial rapid decrease in water weight, you should continue to lose body fat steadily as long as you stick to the diet and maintain a calorie deficit.
One of the hallmarks of a keto diet is a decrease in blood sugar levels and an increase in ketones.
As you progress on a keto diet, you will begin to burn fat and ketones as your primary fuel sources.
The most reliable and accurate method for measuring ketones is to measure your blood ketone levels using a specialized measuring device. This is the method used in most research studies.
The device measures your ketone levels by calculating the amount of beta-hydroxybutyrate (BHB) in your blood. This is one of the primary ketones found in the bloodstream.
According to some experts on the keto diet, nutritional ketosis is defined as blood ketone levels equal to or higher than 0.5 millimolar (mM).
The main disadvantage of this testing method is that it requires pricking your finger to draw blood.
Furthermore, test kits can be expensive. Therefore, most people will get tested once a week or every two weeks.
Another way to measure blood ketone levels is with a breath analyzer.
During ketosis, you'll find acetone, one of the three main ketones in your blood.
This gives you an idea of your body's ketone levels, because more acetone leaves the body when you're in nutritional ketosis.
Acetone breath analyzers have been shown to be fairly accurate, although less accurate than blood monitor methods.
You can also use special indicator strips to measure the presence of ketones in your daily urine.
They can be a quick and inexpensive way to assess your ketone levels daily. However, they are not considered very reliable.
Many people report reduced hunger while following the keto diet.
The reasons for this are still being investigated.
However, it has been suggested that this decrease in hunger may be due to changes in your body's hunger hormones and increased protein intake.
Ketones themselves can also affect your brain and help reduce appetite.
People often report brain fog, fatigue, and feeling unwell when starting a very low-carbohydrate diet. This is called “low-carb flu” or “keto flu.”
However, those who follow a keto diet long-term often report increased focus and energy.
When you start a low-carbohydrate diet, your body must adapt to burning more fat for fuel instead of carbohydrates.
When you enter ketosis, a large part of your brain begins to burn ketones instead of glucose. It may take a few days or weeks for this to start working properly.
Ketones are an incredibly powerful fuel source for your brain. They've even been tested in a medical setting to treat brain diseases and conditions like concussion and memory loss.
Eliminating carbohydrates can also help control and stabilize blood sugar levels. This can further improve focus and enhance brain function.
Initially switching to the keto diet can be one of the biggest challenges for new dieters. The most common side effects may include weakness and fatigue.
These factors often cause people to discontinue the diet before entering full ketosis and reaping most of the long-term benefits.
These side effects are natural. After running on a carbohydrate-heavy fuel system for several decades, your body has to adapt to a different system.
As you can imagine, this transition won't happen overnight.
To reduce fatigue during this transition, you may want to take electrolyte supplements.
Electrolytes are often lost due to a rapid decrease in your body's water content and the elimination of processed foods that may contain added salt. In this case, consuming mineral water, taking supplements, and adding the correct amount of salt will help resolve the issue.
When adding these supplements, be sure to include sodium, potassium, and magnesium.
As discussed above, eliminating carbohydrates can initially lead to general fatigue. This includes changes in exercise performance.
Primarily, this is caused by a depletion of glycogen stores in your muscles. They provide the main and most efficient fuel source for all types of high-intensity exercise.
After a few weeks, many people on the keto diet report that their performance has returned to normal. In some ultra-endurance sports and events, the keto diet may even be beneficial.
Furthermore, an increased ability to burn more fat during exercise is another advantage of ketogenic diets.
A small but renowned study found that athletes who switched to the keto diet burned 230% more fat when exercising compared to athletes who did not follow the diet.
The elite of the keto diet athletes While it's unlikely to maximize performance, once you're adapted to the fat, it should be sufficient for general exercise and recreational sports.
A keto diet typically involves a major change in the foods you eat.
Digestive problems such as constipation and diarrhea are common initial side effects.
Some of these problems should lessen after the transition period, but it may be important to be mindful of different foods that could cause digestive issues.
Also, make sure you're still eating plenty of healthy, low-carbohydrate vegetables that are also rich in fiber.
Most importantly, avoid the mistake of eating a diet lacking variety. Doing so can increase your risk of digestive problems and nutrient deficiencies.
For many keto dieters, a major problem is sleep, especially when they first change their diet.
Many people report insomnia or wake up at night when they first drastically reduce their carbohydrate intake.
However, this usually resolves within a few weeks.
Many long-term keto dieters claim they sleep better than before after adapting to the diet.
References;
David S Ludwig, The Ketogenic Diet: Evidence for Optimism but High-Quality Research Needed, The Journal of Nutrition , Volume 150, Issue 6, June 2020, Pages 1354–1359, https://doi.org/10.1093/jn/nxz308
Deemer SE, Plaisance EP, Martins C. Impact of ketosis on appetite regulation-a review. Nutr Res. 2020 May;77:1-11. doi: 10.1016/j.nutres.2020.02.010. Epub 2020 Feb 20. PMID: 32193016.
Yuan, X., Wang, J., Yang, S. et al. Effect of the ketogenic diet on glycemic control, insulin resistance, and lipid metabolism in patients with T2DM: a systematic review and meta-analysis. Nutritional Diabetes 10 , 38 (2020). https://doi.org/10.1038/s41387-020-00142-z
