heat stroke

Eating actually exhibits a result of your body consuming energy to process that food- And in turn, generating heat. If your goal is to stay cool, IE, not hyperthermic, Eating would actually be detrimental, not beneficial. (Edit: Provided you had eaten recently enough to have a store of glycogen and other stuff as addressed below; and you would want to gain those things by eating lightly, not a hearty meal)

Your anecdotal example is you suffering a case of hyperthermia -and- a case of more extreme hunger which results in a lack of a lot of needed things in your blood, most notably glycogen, which can leave you feeling more easily tired and prone to the ill effects of other issues your body is experiencing.