A grounded synthesis of the most-cited open-access papers on honey bee nutrition. Every claim is traceable to a cited study; curated overview, not exhaustive.
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Pollen is the colony's source of protein, lipids and micronutrients, and the adequacy of floral resources is a foundational determinant of bee health and survival (Di Pasquale 2013). Poor nutrition is one of the interacting stressors behind colony decline, both directly and by shaping the immune competence that determines resilience to parasites and pathogens (Di Pasquale 2013).
Not all pollen is equal, and variety counts. Pollen quality and diversity influence honey bee physiology and immune competence, so a monotonous or poor diet leaves bees more vulnerable even when calories are sufficient (Di Pasquale 2013). The colony's requirements also shift across the year, tracking the changing nutrient composition of seasonal pollens as the colony moves between brood rearing and overwintering preparation (DeGrandi-Hoffman 2018).
A natural assumption is that bees regulate their own nutrition, but the evidence is mixed: nurse bees do not necessarily consume pollens according to nutritional quality, meaning colonies can be undernourished even amid available forage (Corby-Harris 2018). Sub-optimal nutrition leaves measurable molecular signatures in developing nurse workers, providing biomarkers of nutritional stress (Corby-Harris 2014).
Where forage is insufficient, beekeepers feed pollen substitutes and artificial diets, especially in intensively managed pollination operations. Their effects on colony performance, immunity and physiology vary by formulation, and no substitute fully matches diverse natural pollen (Ricigliano 2022; Diedrick 2025; Li 2025).
The ultimate driver of nutritional stress is the landscape. Agricultural intensification and habitat change reduce the abundance and diversity of floral resources, a decline that sits alongside parasites and pesticides as a core pressure on bees (Di Pasquale 2013).
Nutrition is the substrate on which all other stressors act: well-fed colonies tolerate Varroa, viruses and pesticide exposure better than starved ones. Improving forage diversity and timely supplemental feeding are among the few levers that strengthen the colony against the whole stressor complex — see the multi-stressor model.
Di Pasquale et al., PLoS ONE 2013 · 421 citations — Pollen quality and diversity shape physiology and immunity.
DeGrandi-Hoffman et al., Journal of Insect Physiology 2018 · 47 citations — Nutritional requirements shift seasonally.
Corby-Harris et al., PLoS ONE 2018 · 27 citations — Bees do not reliably self-select optimal diets.
Corby-Harris et al., BMC Genomics 2014 · 31 citations — Molecular biomarkers of nutritional stress.
Ricigliano et al., BMC Veterinary Research 2022 · 49 citations — Pollen-substitute formulations vary in their effects on colony health.
Curated synthesis of representative and most-cited studies — not exhaustive. Explore the full evidence base via search. Related: Health overview · Multi-stressor model · Pesticides overview.