Foods to Avoid for Energy: 6 Choices to Limit

Sugary breakfast cereals, pastries and white bread are three foods to limit if you want steadier energy, especially when they take the place of more balanced meals. They are not inherently off-limits, and no single food guarantees an energy slump. For hydration alongside meals, see the best drinks for energy.

Check urine color as one rough hydration cue: pale yellow often suggests adequate fluid, although medicines and supplements can change its color. For a broader estimate, use the hydration checker.

Which foods are best for energy, and which 6 are worth limiting?

For everyday meals, choose a mix of foods that provide carbohydrates, protein and fiber. Whole grains, beans, fruit, vegetables, eggs and fish are examples you can combine in ways that suit your appetite and preferences. Rather than avoiding every food on this list, consider how often it is the main part of a meal and what you could add or substitute.

A 2022 observational study of postmenopausal women found that a Mediterranean-style eating pattern was associated with more favorable fatigue and energy scores. Its analyses also linked replacing non-whole grains with whole grains and replacing red or processed meat with fish to more favorable fatigue scores. The study cannot prove that those substitutions caused the differences, and it did not test each food below.

1. Sugary breakfast cereals

Some breakfast cereals contain substantial added sugar but little fiber or protein. A bowl on its own may be less filling than a breakfast that includes those nutrients, potentially leaving you hungry before your next meal. That does not mean every sweetened cereal causes a blood sugar crash or fatigue.

How to use this advice: Compare cereals using their nutrition labels, checking both added sugar and fiber while accounting for differences in serving size. Choose a higher-fiber option more often, or pair a cereal you enjoy with yogurt, milk, nuts or fruit rather than relying on it alone.

Evidence: The case for a more balanced breakfast is practical and based on food composition. The study above supports an association between whole-grain choices and fatigue scores, but it did not establish that a particular cereal reduces energy.

2. Pastries and doughnuts

Pastries and doughnuts often combine refined flour and added sugar, with relatively little fiber or protein compared with a balanced meal. They provide calories, but a pastry by itself may not keep you satisfied for long. How you feel afterward varies with the food, portion and rest of your meal.

How to use this advice: Enjoy a pastry occasionally rather than treating it as the only component of breakfast whenever you need a meal that will last. If you want one with breakfast, consider adding a protein-containing food, such as yogurt or an egg, and some fruit.

Evidence: There is no direct evidence in the listed studies that pastries themselves cause fatigue. The recommendation is a practical way to make room for foods that contribute more fiber and protein; it is not a claim that pastries are forbidden.

3. White bread and other refined-grain staples

White bread and many other refined-grain products contain less fiber than comparable whole-grain versions. Fiber can contribute to fullness, and choosing whole grains can make it easier to build a meal that is more satisfying. Some refined-grain products are enriched, however, so they are not devoid of nutrients.

How to use this advice: Try whole-grain bread for a sandwich, or combine the bread you prefer with a filling such as eggs, beans or fish and add vegetables. If you are comparing packaged bread, check the ingredient list and fiber on the label rather than judging by color alone.

Evidence: The observational study above found that modeled substitution of whole for non-whole grains was associated with more favorable fatigue scores. That is indirect evidence for this swap, not proof that white bread causes low energy or that every person will notice a change.

4. Candy

Candy can supply rapidly available carbohydrate, but it generally does not provide the fiber or protein that makes a snack more sustaining. Eating candy when you are hungry may leave you looking for food again soon. A brief change in how alert you feel is not necessarily evidence of a dangerous blood sugar change.

How to use this advice: If you want something sweet between meals, consider having it alongside a more substantial snack, such as fruit and nuts or yogurt. Candy can still fit occasionally; there is no evidence-based rule that everyone must eliminate it for better energy.

Evidence: The listed studies did not test candy as a cause of fatigue. This suggestion follows from the difference between candy and a more balanced snack, not from a clinical trial showing that avoiding candy prevents an afternoon slump.

5. Processed meats

Processed meats, such as bacon, sausage and deli meat, can supply protein, but relying on them frequently can crowd out other protein choices. Their connection with energy is less direct than the question of whether a meal is large enough and balanced. Eating processed meat does not automatically make you tired.

How to use this advice: For some meals, replace processed meat with fish, beans, eggs or another protein you enjoy. You could also keep a smaller amount of processed meat for flavor and build the rest of the meal around whole grains and vegetables. Choose the approach that fits your usual eating pattern rather than making an abrupt restriction.

Evidence: In the observational study, modeled substitution of fish for red and processed meat was associated with more favorable fatigue scores. The study grouped red and processed meat for that analysis, so it does not prove that any individual processed meat causes fatigue.

6. Oversized fried fast-food meals

A very large meal can leave some people feeling uncomfortably full or sleepy, whether or not it contains fried food. Large fried fast-food meals may also leave little appetite for vegetables, whole grains or other foods that add variety. The response is individual, and neither frying nor fast food invariably causes an energy dip.

How to use this advice: If a large fried meal regularly leaves you uncomfortable, try a more manageable portion and add a vegetable or another side you enjoy. You can also save leftovers for another meal. Pay attention to how the whole meal affects you rather than assuming that any single ingredient is responsible.

Evidence: The listed studies do not directly establish that fried fast food causes fatigue. This is a symptom-guided adjustment, not a proven treatment for low energy.

How often should you limit these foods?

There is no established frequency or portion cutoff in the evidence provided for preventing fatigue from these foods. A useful starting point is to notice which choices regularly leave you hungry, overly full or dissatisfied, then change one meal or snack at a time. Look for a pattern over several days rather than blaming a food for one tired afternoon.

Avoid compensating by skipping meals or eating too little. Inadequate food, poor sleep, stress, illness and medications can all contribute to tiredness, so a food swap may not resolve it. An overall eating pattern that you can maintain matters more than making every meal perfect.

If packaged foods are convenient, use the label to compare options within the same category. Fiber, added sugar and serving size can help you make a choice, but a label alone cannot predict how energetic you will feel.

Who should be careful, and when should you see a doctor?

If you have diabetes or take insulin or other glucose-lowering medicines, ask your care team for an individualized eating plan. Fast-acting carbohydrate may be needed to treat low blood sugar, so do not avoid it when following your prescribed treatment plan. Do not change or stop medication based on an energy-focused diet.

Pregnant or breastfeeding people, children, and anyone with a history of an eating disorder should seek individualized advice before making restrictive changes. If fatigue is persistent, unexplained or interfering with daily life, see a healthcare professional rather than relying on food changes alone. Seek urgent medical help for chest pain, severe shortness of breath, fainting or new confusion.