Neutral lighting actually works best in a kitchen as it’s in the middle of the kelvin scale and neither too red or blue.
Warm lighting is around 2700K – 3000K and although pleasing to the eye, can often effect the apparent colour of kitchen surfaces, especially white or pale gloss doors and worktops so careful consideration needs to be made here.
Cool lighting is generally above 5000K and can appear very blue. It can effect the look of food and drink, so is not best in task areas.
In summary then, the best choice is lighting that’s somewhere between 3000k and 4000K.