Bees thrive on two main foods: nectar for energy and pollen for protein, fats, vitamins, and minerals. When you encounter a grounded, exhausted bee and want to help, or when you keep hives and need to supplement during lean times, the safest offering is a small amount of white granulated sugar dissolved in water. The picture gets more complicated from there, because several foods that seem bee-friendly can actually harm or kill them, and bees have surprisingly specific nutritional requirements that no single food source fully satisfies.
What Bees Eat in the Wild
A healthy bee colony collects nectar, pollen, water, and small amounts of plant resins. Nectar supplies carbohydrates, which fuel flight and generate the heat that keeps the hive at a stable temperature. Pollen is the protein source, and it delivers much more than that: lipids, amino acids, vitamins, minerals, and sterols that bees cannot synthesize on their own. A diet based on pollen from multiple flower species is considered ideal, because no single plant’s pollen contains every nutrient a colony needs in the right proportions.1PubMed Central. An Overview of the Nutritional Requirements of Honey Bees (Apis mellifera Linnaeus, 1758) This is why monoculture landscapes, where bees forage on just one crop for weeks at a time, can leave colonies nutritionally stressed even when food looks abundant.
Inside the hive, bees process these raw materials. They convert nectar into honey by evaporating most of the water and adding enzymes. They pack pollen into cells and ferment it into “bee bread,” which is more digestible and stores longer. Young nurse bees consume large amounts of pollen and secrete a protein-rich jelly from glands in their heads to feed larvae. Queen larvae receive a version of this jelly (royal jelly) that is higher in crude protein and amino acids than the jelly fed to worker larvae, particularly as development progresses.2PubMed Central. The Ontogeny and Dietary Differences in Queen and Worker Castes of Honey Bee (Apis cerana cerana)
Emergency Feeding for a Tired Bee
If you find a bee on the ground that seems sluggish or unable to fly, it may simply be cold or exhausted. The most common advice is to offer a few drops of sugar water, made by dissolving roughly two teaspoons of plain white granulated sugar in one teaspoon of lukewarm water. Place it near the bee on a spoon or shallow lid. The bee can drink the sugar solution and often recovers enough energy to fly within 15 to 30 minutes.
Honey might seem like the natural choice, but you should never feed store-bought honey to a bee. Honey from unknown sources can carry spores of Paenibacillus larvae, the bacterium that causes American foulbrood, a devastating and highly contagious brood disease. Research has confirmed that contaminated honey acts as a reservoir for these spores, and bees that consume it can carry the pathogen back to their colony, eventually triggering clinical disease.3PubMed. The distribution of Paenibacillus larvae spores in adult bees and honey and larval mortality, following the addition of American foulbrood diseased brood or spore-contaminated honey in honey bee (Apis mellifera) colonies Even pasteurized honey is not safe, because the spores survive pasteurization temperatures. This is one of the most important things to know about feeding bees: honey from the grocery store is a genuine disease vector.
Sugar Syrup for Beekeepers
Beekeepers routinely feed sugar syrup to colonies during nectar dearths, in early spring before flowers bloom, or in autumn to ensure the hive has enough stores for winter. The standard approach is a syrup made from white cane or beet sugar and water. A thin syrup (roughly equal parts sugar and water by weight) mimics nectar flow and stimulates brood rearing in spring. A thicker syrup (about two parts sugar to one part water) is used in autumn because bees can store it more quickly with less effort to evaporate the moisture.
The sugar itself matters. White granulated sugar is considered safe. Brown sugar, raw sugar, molasses, and organic unrefined sugars contain impurities and minerals that bees struggle to digest, and these can cause dysentery, especially during winter confinement when bees cannot take cleansing flights. High-fructose corn syrup (HFCS) is widely used in commercial beekeeping for its convenience, but it carries a specific risk: when HFCS is stored at warm temperatures or exposed to heat, it forms hydroxymethylfurfural (HMF), a compound identified as the most noted toxin to honey bees in heated sugar products.4PubMed. Formation of hydroxymethylfurfural in domestic high-fructose corn syrup and its toxicity to the honey bee (Apis mellifera)
HMF has low acute toxicity, meaning a single exposure is unlikely to kill a bee outright. The real danger is chronic exposure. The European Food Safety Authority evaluated HMF risk and found clear time-reinforced toxicity: the longer bees are exposed, the lower the dose needed to increase mortality. Winter bees, which live for months rather than weeks, are especially vulnerable. The reference points the EFSA calculated for chronic exposure over 90 to 180 days are dramatically lower than the threshold for short-term feeding.5PubMed Central. Evaluation of the risks for animal health related to the presence of hydroxymethylfurfural (HMF) in feed for honey bees The practical takeaway is straightforward: if you feed HFCS, never let it sit in sunlight or warm storage for extended periods before giving it to bees, and many beekeepers prefer plain sugar syrup specifically to avoid the HMF problem.
Protein and Pollen Substitutes
Pollen is the only natural protein source for bees, and colonies cannot raise healthy brood without it. Research has established that the ideal protein level in a supplemental diet for brood rearing falls between about 23 and 30 percent; going higher, to around 50 percent protein, actually impairs colony performance and should be avoided.6Apidologie. Nutrition and health in honey bees This is somewhat counterintuitive. More protein is not better, and beekeepers who mix their own pollen patties need to get the ratio right.
Commercial pollen patties are widely used, especially in early spring before natural pollen is available. These are typically made from a mix of pollen, soy flour or brewer’s yeast, and sugar syrup, pressed into flat cakes that sit on top of the frames inside the hive. Analysis of these patties shows that their protein and fat content tends to be lower than that of the raw bee pollen used to make them, while the carbohydrate content is much higher, largely because of the sugar binder added during manufacturing.7Journal of Asia-Pacific Entomology. Changes in nutritional composition from bee pollen to pollen patty used in bumblebee rearing This dilution effect means patties are not a perfect substitute for fresh pollen, and colonies given only artificial protein sources tend to produce fewer and less robust bees than colonies foraging on diverse natural pollen.
Despite decades of research, the field has not settled on a universally accepted balanced artificial diet for bees. Scientists around the world have formulated various recipes based on the nutrient profile of pollen and honey, but none has emerged as a gold standard for commercial beekeeping.8PubMed Central. Honeybee nutrition and pollen substitutes: A review In practice, the best substitute for pollen remains more pollen: planting diverse forage so bees can collect the real thing is consistently more effective than any processed supplement.
Water and Mineral Needs
Water is easy to overlook, but bees need it constantly. They use water to dilute honey for consumption, to cool the hive through evaporative air conditioning on hot days, and to dissolve crystallized stores. A strong colony can consume more than a liter of water on a hot day. If you keep bees or want to support them in your yard, providing a clean, shallow water source with stones or floating corks (so bees can land without drowning) makes a real difference.
What’s more interesting is the mineral content of that water. Bees do not just drink any water equally. Field studies have consistently found that honey bees show a strong preference for sodium over plain deionized water. In autumn, when pollen becomes scarce, they also seek out water containing calcium, magnesium, and potassium, minerals they normally get from pollen. In summer, when pollen is abundant, bees actually avoid those same mineral solutions, suggesting they can sense and respond to their own nutritional gaps with surprising precision.9Ecological Entomology. Seasonality of salt foraging in honey bees (Apis mellifera)
Lab studies have confirmed this sodium appetite at the individual level. Young adult worker bees offered sodium solutions at different concentrations consistently chose higher concentrations and ate significantly more food overall when sodium was available, compared to controls offered no sodium.10PubMed Central. Behavioural regulation of mineral salt intake in honeybees: a self-selection approach A tiny pinch of sea salt in a bee waterer can be genuinely helpful, particularly if hives are located far from natural mineral sources like mud puddles or damp soil.
Naturally Toxic Plant Compounds
Not all nectar is safe for all bees. Some plants produce secondary compounds in their nectar, chemicals typically used to defend against herbivores, that can harm pollinators. The best-documented example involves rhododendron. Invasive Rhododendron ponticum produces nectar containing grayanotoxins, and research comparing the effects across three bee species found dramatically different outcomes. Honey bees fed grayanotoxin I were roughly 20 times more likely to die than controls, while bumblebees showed no reduction in survival. Solitary mining bees were not killed directly but were deterred from feeding and displayed visible signs of distress after consuming the toxin.11Functional Ecology. Nectar chemistry modulates the impact of an invasive plant on native pollinators
Pyrrolizidine alkaloids (PAs) are another group of plant-derived toxins found in the nectar and pollen of plants like ragwort, comfrey, and certain borage relatives. Feeding experiments showed that certain forms of these alkaloids are toxic to honey bees at high concentrations, with toxicity linked to a specific structural feature of the molecule. At lower levels, bees tolerated the compounds without obvious negative effects, but the alkaloids acted as feeding deterrents at moderate concentrations, meaning bees would avoid the food if they could taste it.12PubMed. Feeding deterrence and detrimental effects of pyrrolizidine alkaloids fed to honey bees (Apis mellifera) In most natural settings, bees avoid heavily contaminated nectar. Problems tend to arise when a toxic plant is the only food source available, such as in areas where invasive rhododendron dominates the landscape.
Human Foods That Do Not Help
People who find tired bees sometimes reach for fruit juice, soft drinks, maple syrup, or artificial sweeteners, but none of these are appropriate. Fruit juice ferments quickly, attracts other insects, and contains acids and compounds bees are not adapted to process. Soft drinks and flavored syrups contain dyes, preservatives, and citric acid that offer no nutritional value and can cause digestive problems. Maple syrup and agave, while natural, contain complex sugars and minerals that are harder for bees to digest than simple sucrose.
Artificial sweeteners are a particularly poor choice. Research on sugar alcohols found that substances like xylitol, sorbitol, and erythritol did not act as feeding stimulants for honey bees at all, meaning the bees were not interested in consuming them. Bumblebees responded to sorbitol, and wasps responded to all three, but honey bees essentially ignored these sugar substitutes.13PubMed Central. Sugar alcohols have the potential as bee-safe baits for the common wasp Offering a bee an artificially sweetened drink is like offering someone an empty plate: the bee will not eat it, and it wastes time the bee does not have.
The simplest rule is this: white sugar dissolved in water is the only human-produced food you should ever offer a bee. Everything else introduces either disease risk, toxicity, digestive stress, or nutrients the bee cannot use.
Pesticide Contamination in Food Sources
Even when the food itself is the right type, contamination with pesticides can turn a meal into a death sentence. Neonicotinoid insecticides, particularly clothianidin and thiamethoxam, are systemic chemicals applied to crops that end up in the nectar and pollen the treated plants produce.14PubMed Central. Neonicotinoid pesticides and nutritional stress synergistically reduce survival in honey bees This means bees foraging on treated crops are exposed through their normal diet, not through direct spraying.
The interaction between pesticide exposure and nutrition is particularly insidious. Research has shown that these two stressors do not just add up; they multiply each other’s effects. A bee that is already nutritionally stressed because of a poor diet or a nectar dearth is far more vulnerable to pesticide exposure than a well-fed bee encountering the same chemical dose. For backyard beekeepers and gardeners, this is an important consideration when choosing what to plant: a diverse, pesticide-free garden provides both food and a buffer against whatever chemical exposures bees encounter elsewhere in their foraging range.
Probiotics and Gut Health
An emerging area of bee nutrition research focuses on the gut microbiome and whether probiotics can improve colony health. Bees harbor a specialized community of gut bacteria that help digest pollen, produce vitamins, and defend against pathogens. When that community is disrupted by antibiotics, poor nutrition, or disease, bees become more susceptible to infections.
One of the most studied diseases in this context is nosemosis, caused by the microsporidian gut parasite Nosema ceranae. Laboratory trials tested several probiotic formulations on infected bees and found promising results. One single-strain probiotic product reduced the parasite’s spore numbers by about 59 percent in initial tests. When researchers tried multiple doses, certain concentrations not only reduced spore counts significantly but also increased the survival of infected bees to levels matching, and in some cases exceeding, that of healthy, uninfected bees.15PubMed Central. Effects of Prebiotics and Probiotics on Honey Bees (Apis mellifera) Infected with the Microsporidian Parasite Nosema ceranae
These results are from controlled lab settings, and translating them to real hive management is a different challenge. But they hint at a future where supplemental feeding for bees includes not just macronutrients but targeted microbial support. Some beekeepers already add commercial probiotic products to their sugar syrup, though standardized protocols and dosing guidelines are still works in progress.
Feeding Different Types of Bees
Most of the feeding advice available focuses on honey bees, because they live in managed colonies. But if you find a bumblebee or solitary bee that needs help, the same sugar-water solution works. The key difference is behavioral: a honey bee in distress is one individual from a colony of tens of thousands, and its loss, while sad, does not imperil the colony. A bumblebee queen in early spring, on the other hand, is an entire colony’s future. Reviving her with a drop of sugar water can mean the difference between a thriving nest and no nest at all.
Solitary bees, which include mason bees and leafcutter bees, do not store food the way honey bees do. They provision individual cells with a ball of pollen and nectar, lay an egg on it, and seal it up. You cannot really feed solitary bees in the supplemental sense that beekeepers feed honey bees. What you can do is plant the flowers they need: many solitary bees are specialists tied to specific plant families, and providing those plants is the most effective form of “feeding” them.
For anyone planting a bee-friendly garden, variety is the single most valuable thing you can offer. A range of flowering plants that bloom in succession from early spring through late autumn covers the nutritional gaps that any single species leaves open. Native wildflowers tend to provide the best pollen nutrition for native bees, while herbs like thyme, oregano, and lavender are excellent all-around bee plants that also happen to be useful in the kitchen. Avoiding pesticide use in your garden, even organic-approved sprays like pyrethrin that can harm bees on contact, closes the loop between good food and safe food.