Feeling tired after eating can be frustrating, especially when you expect healthy foods to boost your energy. Many people do not realize that food choices strongly affect energy levels. Diets high in processed foods and refined carbohydrates often lead to energy crashes and fatigue.
In a survey of 2,000 adults conducted by Feel Complete, 72 percent reported regular energy slumps, and more than half said their diet was to blame. These effects can feel worse in winter as activity levels drop. Knowing which so-called healthy foods cause fatigue can help you maintain steadier energy all season. Here are 10 “healthy” foods that are making you more tired this winter.
Oatmeal (large or sweetened portions)
Oatmeal is a solid base, but large bowls or instant packets with added sugar can spike blood glucose. Studies show instant oats raise blood sugar more than less processed oats, setting up an energy crash later.
Big portions topped with honey, syrups, or dried fruit can turn oatmeal into a high-glycemic-load meal. Those rapid rises and drops in blood sugar are linked to fatigue and poor concentration.
Fruit smoothies
Fruit smoothies often look healthy but can contain 40–60 grams of sugar when made mostly with fruit, juice, or sweetened yogurt. Liquid sugar digests fast and can trigger quick energy highs followed by crashes.
Adding protein and some fat slows digestion and stabilizes blood sugar. Houston Methodist recommends that a meal replacement smoothie contain at least 20 grams of protein and provide between 400 and 800 calories.
Whole-grain bread and pasta
Whole grains are nutritious, yet very large portions can still raise blood sugar and insulin sharply. The National Library of Medicine reports that research on high-glycemic-load meals links these blood sugar swings to post-meal fatigue and reduced mental performance.
Big carb-heavy meals also pull more blood toward digestion, which can increase drowsiness. In winter, large starch portions combined with low activity make this effect more noticeable.
Low-fat yogurt
Low-fat yogurts often contain added sugars to replace the flavor lost when fat is removed. Some flavored versions deliver sugar levels comparable to those of desserts.
High sugar intake can cause insulin spikes followed by energy dips. Plain yogurt with some fat, plus fruit or nuts, supports more stable energy.
Bananas
Bananas provide potassium and fiber but also deliver fast-digesting carbohydrates. Eaten alone or in large amounts, they can spike blood sugar.
They also contain tryptophan, which supports serotonin and melatonin production. In carb-heavy contexts, this can subtly promote sleepiness.
Turkey and chicken breast
Turkey and chicken breast contain tryptophan, an amino acid involved in sleep regulation. On their own, they are not sedating.
When paired with large carbohydrate-rich meals, insulin shifts allow more tryptophan into the brain. This combination can intensify post-meal drowsiness.
Herbal teas (chamomile, valerian)
Chamomile and valerian are known for calming, sleep-supportive effects. They are often used as bedtime aids for this reason.
Drinking several cups during the day can lower alertness. Afternoon use may nudge the body toward rest when focus is still needed.
Dark chocolate (large amounts)
Dark chocolate contains antioxidants but also sugar, fat, caffeine, and theobromine. A single ounce already delivers notable calories and sugar.
Larger portions can cause brief stimulation followed by blood sugar swings. Eating it late in the day may also disrupt sleep and worsen next-day fatigue.
Nuts and nut butters
Nuts are nutrient-dense but also calorie-rich, often providing 160–200 calories per ounce. It is easy to overeat them.
High-fat foods digest slowly and can leave you feeling heavy or sluggish. Modest portions paired with fruit or yogurt tend to support steadier energy.
Leafy greens eaten raw in winter
Leafy greens are healthy, but large raw salads can be harder to digest for some people in colder months. High fiber and cold foods may increase digestive effort.
This can add to winter sluggishness as the body works to digest and stay warm. Lightly cooking greens often makes them easier to digest and more energizing.
Disclosure: This article was developed with the assistance of AI and was subsequently reviewed, revised, and approved by our editorial team.
Disclaimer – This list is solely the author’s opinion based on research and publicly available information. It is not intended to be professional advice.
20 Odd American Traditions That Confuse the Rest of the World
20 Odd American Traditions That Confuse the Rest of the World
It’s no surprise that cultures worldwide have their own unique customs and traditions, but some of America’s most beloved habits can seem downright strange to outsiders.
Many American traditions may seem odd or even bizarre to people from other countries. Here are twenty of the strangest American traditions that confuse the rest of the world.
