A colony cannot buy groceries — every gram of protein, sugar, vitamin and mineral it runs on is carried in on the legs and in the crops of foraging bees. Pollen supplies protein, fats, vitamins and minerals; nectar (stored as honey) supplies carbohydrate for flight muscle and heat. Once packed into comb cells, pollen is mixed with nectar and glandular secretions and left to ferment into bee bread — an acidified, more digestible, longer-lasting protein store that nurse bees eat to make brood food.
Bee bread is more nutritious than the raw pollen it's made from: fermentation by lactic-acid bacteria and yeasts lowers its pH, breaks down tough pollen exine walls and preserves it for months — effectively "silage" for the colony's protein supply.
A hive cutaway shows bee bread fermenting in comb cells while foragers choose between protein-rich pollen and carbohydrate-rich nectar flowers, keeping the colony's protein and carbohydrate reserves in balance through the seasons.
Pollen deposited in comb cells visibly ferments from bright pollen-yellow into deep bee-bread red as lactic-acid bacteria acidify and preserve it, while nectar/honey and brood cells fill and empty in response to forager traffic and seasonal brood demand.
Pick a season, drag the pollen–nectar focus slider to bias what foragers collect, and toggle a wildflower mix against a single-crop monoculture. Watch the protein, carbohydrate and micronutrient-diversity bars respond, and see the colony cluster and draw down reserves once winter stops all foraging.
A single strong colony can process and store many kilograms of bee bread across a season — its main protein bank for rearing the next generation of brood, especially through the spring build-up.