I went to school with the intention of applying to med school or some other health professional school. I majored in biology and minored in chemistry. I had the grades but did not take the MCAT because I was burned out. Biology/chem majors are not easy! Is it easier than engineering? Well, only if you find the application of engineering courses difficult. Engineering requires much higher level math courses than a bio degree, though a chem degree probably comes close in math in most places (at least a BS in chemistry). My daughter who is in a ChemE program will end up taking only about one more chem course than I did for a minor. But she’ll take much more math plus the engineering courses.
Personally, after getting my undergrad degree and working in industry for a while before returning to grad school, I say IF you can do the high level math well (read that as without stressing and struggling constantly), I’d go for an engineering degree so I’d have more options (and honestly, more respect and better pay should you decide to work a little before med school). I realize that GPA thing is a big deal, and some engineering programs are notorious for lower GPAs, but still, majoring in bio or chem are no guarantee to high GPA either. I see students going into MS programs in anatomy and such in order to get accepted to med school. It’s not all bad (especially for maturity and analytical thinking skills), but certainly adds to the debt load and time commitment.
And as a side note, I’d suggest reading this article: http://www.npr.org/sections/health-shots/2015/05/27/407967899/a-top-medical-school-revamps-requirements-to-lure-english-majors. Very interesting approach, but certainly not for everyone. I have met Spanish majors who are med students. How they did it, I don’t know, but it does happen.