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Accidentally Messed Up on Keto? DO THIS

author avatar Dr. Eric Berg 02/18/2025

You're cruising along on the keto diet, feeling great, and then bam. You realize that the delicious meal you just ate was hiding a secret stash of sugar.

It's easy to slip up when eating food prepared by others, as sometimes, keto diet mistakes just happen.

Suddenly, you're feeling tired and maybe even irritable. This can happen whether you bought it and forgot to read the labels or were in a situation where you were told something wouldn't contain sugar when, in fact, it did.

What Happens When You Accidentally Eat Sugar on Keto?

Your brain operates on two types of fuel like a hybrid car: glucose and ketones. A main point of the ketogenic diet is getting your body to primarily run on ketones by cutting carbs.

Instead of relying on glucose from carbohydrates, your body utilizes ketones produced from fat for fuel.

Interestingly, given the choice, your brain will choose ketones over glucose. So, if you consume a bit too much sugar or other carbs, getting some fast-acting ketones into your body is one thing you might consider.

Increasing ketones

Getting Back into Ketosis Quickly

There are ways that people try to elevate ketones quickly. Some common ways of raising ketone levels are taking Medium Chain Triglycerides, or MCT, in oil or powdered form.

You will likely find them sold as a liquid and also in a powdered version, like a supplement.

There are also other supplement products, exogenous ketones, specifically made to quickly raise your body's ketone levels. The liquid MCT oil tends to be the least expensive route.

But both are very viable options if one is more convenient than the other for you.

The idea is simply that the quick elevation in blood ketone levels may cause the brain to pull those in instead of the available sugar, leaving you feeling back to your best self faster.

In one study, researchers sought to describe the metabolic consequences when coconut oil, a saturated fat predominantly composed of MCT, is added to a high-fat ketogenic diet.

Pay Closer Attention To The Foods That You're Eating

Sometimes, keto diet mistakes happen, but you'll always have more success if you closely know what is going in your mouth. By learning more about the keto diet, you'll better understand how to read and analyze labels.

Some processed foods are just hiding sugar and carbs, sometimes disguised under multiple names. With a greater understanding of labels, you'll catch more of these situations to better stick with your plans to lose weight.

Learning to identify less obvious carb sources gives you the power to choose. For example, many salad dressings often come with lots of extra sugar.

The better prepared that you can get by following efficient keto diet meal-prepping strategies, the more quickly you will realize your plans.

Common Keto Diet Mistakes

Even experienced keto dieters may accidentally make a mistake once in a while. But some common reasons often derail people's plans, and knowing what those reasons are will benefit you to achieve keto success.

Not Consuming Enough Fat

Keto is a high-fat diet, and reducing carbs requires making it up somewhere, usually in fat intake.

A lot of people might cut carbs but often fail to also adequately get the fat into them to fuel their body on keto, potentially leading to feeling poorly and experiencing brain fog.

People seem to struggle sometimes adjusting to prioritizing foods full of healthy fats. Healthy fats may consist of foods such as avocados, nuts, chia seeds, and olive oil.

Adding monounsaturated fats from sources like avocados and olive oil can help support heart health. These fats are considered "good" fats and provide sustained energy on a low-carb keto diet.

Electrolyte Imbalances

It might get difficult at times to adjust your food routine to supply the correct amount of essential minerals, sometimes known as electrolytes, because carb restriction on keto will affect it. This imbalance can lead to feeling unwell, including the infamous "keto flu."

Specifically, levels of potassium, sodium, and also magnesium seem to often get depleted. Paying attention to hydration is helpful, but just increasing table salt alone often won't do the job.

Consuming enough of these is important for many functions, including nerve and muscle.

It can pay off to educate yourself a bit about good food sources in order to understand where these different nutrients will come from when the sources that you might've been getting them from prior change with a low-carb approach.

Leafy greens are often a good source of electrolytes. You can look into different keto recipes to keep a diverse palate.

Ignoring Vegetable Intake

People on the ketogenic diet must prioritize a sufficient intake of high-quality, above-ground vegetables, especially organic meats and vegetables, when possible.

Food quality is essential on keto to make sure there are not a bunch of other ingredients that may impact the body weight. Some vegetables to consider would be spinach, broccoli, or even bell peppers.

In prioritizing getting fat macros high enough, some of these choices with leafy vegetables end up reduced. Veggies are crucial, though, as that's where the source of many electrolytes might get adjusted through.

Without enough vegetables, you risk nutrient deficiencies, which can lead to a range of health issues.

Here's a handy list to provide some low-carb, electrolyte-supporting vegetables to think about incorporating and to understand common keto-friendly serving sizes:

Assortment of high-fiber vegetables

Vegetables and Their Nutrient Content

  • Spinach (1 cup, raw)

    • Potassium: 167 mg

    • Magnesium: 24 mg

  • Avocado (1/2 medium)

    • Potassium: 345 mg

    • Magnesium: 29 mg

  • Broccoli (1 cup, chopped)

    • Potassium: 288 mg

    • Magnesium: 21 mg

  • Kale (1 cup, raw)

    • Potassium: 170 mg

    • Magnesium: 13 mg

  • Swiss Chard (1 cup, raw)

    • Potassium: 136 mg

    • Magnesium: 29 mg

Be sure that any list of keto diet recipes that you use accounts for nutrients properly. Getting this wrong could actually hurt in the end.

Some people are quick to give out random advice but are unaware of a potential downstream downside with that recommendation, including not realizing if someone may have pre-existing health conditions.

"Hidden" Carbs in Foods

Another common point of confusion often involves not properly identifying sneaky carb sources that hide out of obvious view, waiting for their moment. Many products, sauces, and other restaurant menu items add significant carbs sometimes.

Be wary of many keto foods or drinks that promote a lot of different ingredients. Reading through the nutritional labels before adding them to the grocery list will be of assistance and help you with tracking macros.

The better understanding that people have over a product's macronutrient ratio and carbohydrate intake may very well assist them, too, and potentially avoid flu-like symptoms.

You should carefully review the nutrition labels, particularly if you have certain conditions impacted by blood sugar levels.

When you start to drastically cut carbs from the carb diet, people could potentially experience side effects from a transition period that some refer to as the "keto flu." The hormone insulin will need to be understood when starting keto.

Failing to Plan Meals

With a dietary shift like the ketogenic diet, getting into a regular flow with planning meals might feel difficult to pull off. This is more of a factor for folks dealing with very time-sensitive days.

So failing to have proper food-prepped meals often trips up many, potentially causing people to fall off their healthy ketogenic plan more regularly and hinder their progress to burn fat and lose weight.

It helps to really make an effort to have ready meals that just need a little heating and seasoning.

There's no such thing as a perfectly convenient healthy meal when dealing with a strict schedule, but something easy enough that isn't highly processed and comes full of extra carbs is possible to put into motion.

The reason people fail the keto diet, or experience "keto flu", is because of not having an action-plan, such as the case with people eating high levels of carbs and then suddenly, drastically cut carbs.

People use batch cooking, weekend meal prepping, and also various portion-freezing methods with good success.

Having a tracking app will greatly increase results and the ability to stick to a keto lifestyle. A proper app privacy policy is critical before using just any tracking app for your health.

Optimizing Fat Intake to Avoid Keto Pitfalls

One of the most common mistakes on the keto diet is not consuming enough healthy fats to support energy levels and ketosis.

While protein and carbs often take center stage in dietary discussions, fats are the primary fuel source for those following a ketogenic lifestyle.

Strategic fat intake throughout the day can help avoid energy dips and cravings, especially when paired with intermittent fasting.

For instance, taking MCT oil before bed can provide a slow, sustained release of ketones that fuel the brain and body overnight.

MCT oil, known for its rapid conversion into energy, can also support better sleep by stabilizing blood sugar and reducing hunger during fasting windows.

Including this high-quality fat as part of your overall keto plan ensures you maintain ketosis more easily while giving your metabolism the fuel it needs to function optimally.

Making smart, consistent choices with fat intake can prevent plateaus and improve long-term success.

Conclusion

Keto diet mistakes are not necessarily the end of your hard efforts. They present learning opportunities.

The keto journey often faces occasional obstacles, but don't feel discouraged when things might not work out correctly 100% of the time.

What's helpful is making sure that your goals and how to execute them are both clear while having the flexibility to learn along the way. You will lose body fat and weight if your action matches the needed effort.

Having extra tools or hacks at your fingertips might get people back into ketosis more quickly when things take a different turn from that day's plan.

Sticking to a proper diet takes some upfront time and energy, but people get quicker over time. With a well-structured approach, keto success is attainable for anyone.

FAQs about keto diet mistakes

What are common keto mistakes?

Common keto diet mistakes include not eating enough fat, overlooking "hidden" carbs, failing to account for correct electrolyte balancing, and planning meals.

It's also a mistake to not look at food quality. You want to make sure you are eating foods that do not contain unnecessary chemicals.

Make sure the diet you follow works for your situation. If you have any concerns, speak with a professional for assistance to be sure you don't create nutrient deficiencies.

What is the hardest day of keto?

The hardest day of keto varies by the individual. Typically, you may potentially find an adjustment phase when your body and energy systems work through the adaption shift, which could last anywhere between several days to a couple of weeks.

People need to adjust to a new way of eating by allowing stored body fuel, or fat, to be converted into energy so fatty acids can fuel the body.

Don't forget to try new foods like having some avocado or olive oil on a salad with some leafy greens, to provide your body what it needs.

Do and don'ts of the keto diet?

Consume plenty of healthy fats, stay mindful of the mineral and electrolyte levels, focus on whole and low-carb nutrient-rich foods, and have a meal prep and planning approach set to limit your potential need to cheat.

Avoid processed foods when possible, but always look into nutritional labels on any low-carb marketed foods. Watch out for sugars and diet mistakes hidden by complex names.

It's a good habit to get into and not get in situations where the best you can do is "cheat," if possible. You want to have options around. Be sure you learn the proper keto macros if that approach best matches your needs.

Does cucumber break ketosis?

No, cucumbers are low in carbohydrates and work within the guidelines for a standard keto diet. A half-cup of sliced cucumbers contains under 2 grams of total carbs, so cucumbers are typically okay and would be a good choice.

This makes a great keto breakfast snack, in moderation, of course. Make sure your health conditions don't require specific food adjustments that may conflict with keto.

Healthy Keto Guide for Beginner

FREE Keto Diet Plan