Nutrition most definately will play a part in the cats health, also feline diabetes will cause cats to be wobbly and walk in circles. Neurological disorders are also possible and an inner ear infection will also cause this problem. Due to all the extensive problems possible it's best to consult a vet. Better safe than sorry.
It can be a number of things. Injury, stroke, ear infection, blindness, neurological disorders such as feline dementia, etc. Some things are treatable, some things are not. Bring to vet.
The cause of this behavior depends on the circumstances. A cat walking in circles around you may be looking for food or affection. A cat that keeps raising her tail and meowing may be in heat. If your feline is not receiving adequate nutrition or is showing other signs of illness then it is possible that illness is present.
A cat that persistently walks in circles needs to be taken to a vet as soon as possible. This could be caused by nutrition, a tumor, age, or other causes.
A cat doing this could have one reason or multiple reasons. Nutritional may play a part if the cat is old and weak. Likewise, old age can cause the brain to not function normally like processing motor skills. A tumor is another and more likely cause of very odd and weird behavior, especially around the brain.
a vet told me when a cat is walking in circle it usually mean that the cat has a ear infection. and need to be taken care of because it can harm the ear canel