To find proof as to whether he is "in love" or not, Yukimura pats Himuro on the head from point-blank range. Seeing this, Ibarada, an upperclassman in the Ikeda Lab, talks about the need for a control experiment. In other words, in order to prove that the racing of his heart is because of Himuro specifically and not just because he's facing a woman, Yukimura has to pat Kanade and Ibarada on the head too. Himuro, on the other hand, sets out to prove that food made with love tastes better and cooks, but...
Are you saying that something so 
insubstantial will make the food taste better?
أتقولين بأنّ شيئًا لا أساس له كذاك 
قد يجعل الطعام أكثر لذّة؟
Meinst du, dass etwas so Belangloses
das Essen besser schmecken lässt?
¿Dices que algo sin fundamento
le dará mejor sabor a la comida?
¿Dices que algo sin fundamento
le dará mejor sabor a la comida?
Cette chose mal définie
rendrait la nourriture meilleure ?
Mi stai dicendo che una cosa
così inconsistente rende il cibo più buono?
Diz que algo tão insubstancial
deixa a comida melhor?
Полагаешь, что-то столь нематериальное 
может улучшить вкус еды?