Why a busy-looking bird may still be eating very little
Parrots are talented food handlers. A bird changing diets can spend long, convincing periods at the bowl picking up new pellets, crunching them into crumbs, and dropping most of the pieces, or husking familiar seeds mixed in and ignoring everything else. Activity at the bowl is not intake. During any diet change, you need evidence from the bird's body and droppings, not from how keen he looks at breakfast.
This matters because birds have fast metabolisms and small reserves. A stubborn bird who quietly eats a fraction of what he needs can lose condition over days, and the earlier you spot the gap, the gentler the fix — usually slowing the transition rather than abandoning the new diet altogether.
Weight is the most honest measure
Weigh him before the change begins, then weekly during it, on a kitchen scale fitted with a perch, at the same time of day — first thing, before breakfast, gives the most comparable reading. Write every number down; memory smooths out exactly the drift you need to see. A stable weight while he explores the new food is success. A small wobble in the first few days can happen as tastes adjust, but a continuing fall over two weigh-ins, or a bird who also feels sharper along the breastbone when you handle him, means he is not taking in enough and the old food should come back in larger proportion while you regroup.
For a young or small bird — a budgie or cockatiel — the margin is thinner and changes show faster, so weigh twice weekly during the switch and treat any clear drop as a same-week problem, not a wait-and-see one.
Droppings and the bowl tell the daily story
Between weigh-ins, droppings are your daily gauge. A bird eating normally produces droppings at roughly his usual frequency, with a formed dark portion. Noticeably fewer droppings, or droppings that shrink to mostly white and liquid for more than a day, suggest very little food is going through. Colour can shift with new vegetables and pellets, which is expected; volume and frequency are the parts to watch.
Then read the bowl like a detective. Whole pellets untouched at the bottom, new food flung to the cage floor, and only the familiar items missing tells you he is selecting, not eating. Crumbs and powdered pellet dust in and under the bowl, by contrast, usually mean he is crunching and swallowing at least some. Offer the new food first when he is hungriest, keep a portion of the old diet available later in the day during the transition, and never let enthusiasm for the plan leave him with a bowl he will not touch at all.
When eating too little becomes urgent
Contact an avian vet promptly if he refuses almost everything for a full day, sits fluffed and quiet, spends time on the cage floor, or loses weight at consecutive weigh-ins despite the old food being available. Very young birds, recently weaned birds, and birds already underweight have far less margin and should be seen sooner. Bring your weight notes and a clear account of what was offered and what vanished — that detail helps the vet judge whether this is pickiness, beak or mouth pain, or illness hiding behind the diet change. Keep those daily checks assigned and ticked off rather than left to chance, and KinsLe Care Teams lets you share the weighing and bowl checks so the record stays complete.