Look for a softly rounded body with no sharp hip bones or skull ridges standing out, limbs and a tail base in proportion, and clear signs of feeding such as lick marks in the food dish and regular droppings. Body condition in a crested gecko is a pattern of several small signs read together. No single feature settles the question, because a gecko photographed mid-climb can look slimmer than the same animal resting flat.
Read the Shape From Above and the Side
From above, a well-fed gecko shows a gentle width through the belly and hips, with the hip bones present but padded rather than pointed. From the side, the belly line should curve softly instead of sagging heavily or tucking up tight. Sharp ridges along the skull and a narrow, bony look around the shoulders suggest an animal that has not been taking in enough. At the other end, deep folds at the limb joints and a very wide belly can point to overfeeding, which matters because crested geckos offered rich food without climbing space gain weight quietly. Compare the tail base as well. A plump, smooth tail base supports the picture of a gecko that eats well.
Remember That a Missing Tail Changes the Picture
Many crested geckos drop their tails, and a dropped tail does not grow back. A tailless gecko, sometimes called a frogbutt for its rounded rear end, is not automatically underfed or unwell. Judge that animal by its belly shape, hip padding, and activity rather than by tail condition, and do not let a seller present a missing tail as damage that should lower the price or as a defect you must accept without questions. Ask when the tail was lost, because a recent injury should look clean and healed, and ask how the gecko has eaten since.
Check the Evidence Around the Gecko
The enclosure tells the truth alongside the body. Look for lick marks and a lowered level in the food dish, fresh food offered on a raised ledge rather than an empty dried dish on the floor, and regular small droppings on leaves and walls. Ask which prepared diet the gecko is on, how often food is offered, and whether insects are given as well. A seller who can answer those questions in detail, and who can show feeding records or weight notes, is describing a routine you can verify. A gecko that is bright at dusk, climbs strongly, and grips confidently with its toe pads is showing you the energy that regular feeding produces.
Weigh, Because Eyes Deceive
Ask to see the gecko weighed, or weigh it yourself on a small scale that reads in grams. A single weight means little without context, since adults vary in build, but a short series of weights shows the direction clearly. Steady or gently rising weights in a growing juvenile, and a stable weight in an adult, support what your eyes suggested. Falling weights contradict a good report even when the gecko still looks acceptable, because condition is spent before shape changes dramatically. Record the date beside every weight, so the trend survives memory.
Know the Signs That Need a Vet
Sunken eyes, protruding hip bones, a wavy or rubbery jaw, trembling limbs, or lasting lethargy go beyond a feeding question. Those signs can have several causes that a veterinarian needs to investigate, and a new owner should not buy first and hope feeding fixes them. If you already own the gecko, seek veterinary advice promptly rather than simply offering richer food. KinsLe's Transferrable Profiles makes the honest version of this handover easy, because the gecko's diet, feeding rhythm, and dated weight notes move with its profile when it changes homes.