If you live in a cold rainy climate, work hard all day and come home to eat something, choose between a hot dinner and a tepid dinner......
If you are sitting beneath a vine-covered pergola in a sunny warm climate and have had a sweaty hot work day, would you want a hot roast dinner?
I don't know what you've been told Shasha but calories are calories, aand your body's only method of distinguishing the temperature of food is the resultant effect of cooking on ease of digestion. Other than than, mother nature ironically doesn't care where or how it arrives.