Although not unthinkable, more likely, consider the effect of mental health, socioeconomic background, momentary stress levels, education level, etc that can in

Although not unthinkable, more likely, consider the effect of mental health, socioeconomic background, momentary stress levels, education level, etc that can influence both eating habits and cognitive abilities... I'm not saying their hypothesis isn't plausible, their data just doesn't get us an inch closer to confirming it...