4. Energy Drinks and Protein and Meal Replacement Bars
Many meal replacement bars and protein or snack bars aren’t much better than a sugar-packed candy bar. In fact, no matter how purportedly healthy a bar is, it is unlikely any meal replacement bar can be an adequate replacement for a balanced proper meal of natural whole foods.
People are under the impression that higher protein content means the food or beverage is healthier, but that’s not always the case when it comes to processed foods. Protein bars and shakes may not be as healthy as you think when they come with artificial sweeteners, colors, oils, and thickeners.
A fruit punch Gatorade energy drink has a whopping 34 grams of added sugar, which is a huge no-no on keto and could impede your fitness and weight loss goals.  A 16-ounce can of Monster energy drink has 54 grams of added sugar, which might be difficult for some keto dieters to wrap their heads around! You don’t have to be a low-carb advocate to realize this is way too much sugar. 
Researchers have associated drinking sweetened beverages with health problems, such as fatty liver, obesity, and high blood pressure in kids and adolescents.   The energy you feel you obtain from an energy drink may not be the healthier choice due to the overuse of stimulants like caffeine.
5. Labeled ‘Sugar-Free’ and ‘Diet’
Products labeled ‘sugar-free’ or ‘diet’ often contain artificial sweeteners like aspartame (Equal® or NutraSweet®). Aspartame is 200 times sweeter than sugar, which may have adverse effects on metabolism and make you crave more and more sweet-tasting foods and sugar over time. 
Aspartame is frequently used to sweeten:
- Powdered drinks
- Frozen desserts
- Chewing gum
- Jello mixes and dried pudding
- Certain dairy products and breakfast cereals
- Diet soft drinks
- Dried dessert mixes
Many keto dieters prefer more natural sweetener options and sugar replacements like stevia and monk fruit.
Anti-aspartame activists claim there’s a link between aspartame and a number of ailments, including depression, attention deficit hyperactivity disorder (ADHD), cancer, weight gain, lupus, dizziness, and neurological problems. Studies are mixed, with some showing increased symptoms, disease acceleration, or risk and others reporting no negative outcomes with aspartame consumption.   
6. Labeled ‘Low-Fat’ or ‘Fat-Free’
If you’re on a keto diet, you’re certainly not avoiding fat; rather, you should be consuming sufficient healthy fat and protein from natural sources like avocado, meats, seafood, nuts, and seeds.
Surprisingly, low-fat and fat-free foods often contain more sugar and more calories. Remember, much of the flavor is lost when the fat is removed, so manufacturers turn to sugar or artificial additives instead. Low fat often means high carbohydrates, which can increase your triglycerides and lead to cholesterol problems. Less fat also means that the carbohydrates you consume affect your blood sugar more rapidly, causing it to spike. You risk feeling hungry, weak, and tired without enough fat and protein. 
7. Prepared Salads
You can certainly find prepared salads that are satiating, healthy, and low-carb. That being said, salads can be deceiving, and keto dieters may be fooled into thinking a restaurant salad is a perfect keto choice when it’s actually way too high in carbs.
For example, Panera Bread’s citrus Asian crunch salad with chicken may seem like a lower-carb option, but it clocks in at 38 grams of net carbs.  Even those not following a keto diet may find prepared salads to be surprisingly high in unnecessary sugar and even calories.
Be mindful of the sauces and carb count of restaurant-prepared salads. Try a salad and salad dressing recipe from Ketogenic.com:
8. Breakfast Cereal
Breakfast cereals usually aren’t the healthiest way to start your day because they’re made with refined grains, so they’re high in sugar and starch but usually low in fiber, protein, and nutrients. It’s difficult to obtain lasting energy if your morning begins with mostly starch and sugar that will cause your blood sugar to spike and later plummet. Honey Nut Cheerios is marketed as a heart-healthy choice, but one cup contains 12 grams of added sugar. Consuming excessive amounts of sugar definitely isn’t associated with heart health and could increase the risk of heart disease. 
Instead of traditional boxed cereals, crunch on a Ketogenic.com cereal recipe and continue to progress toward your goals.
9. Vegetable Oils and Margarine