Point out to her that it will allow you to live healthier, longer. There will be other benefits as well for her as you lose weight.......let's just say, your anatomy will improve, and Smilin' Bob will have nothing on you.
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. “He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you.”- Fredrick Nietzsche
"We can judge the heart of a man by his treatment of animals." - Immanuel Kant