I am writing this seriously - if you are 27 years old, working 37.5 hours in an office job, eating right and healthy but tired at the end of a work week you may want to look at increasing the amount of sleep you get. Honestly, there are some jobs or odd shifts where 37.5 hours a week can realistically fatigue you but at your age an office job below 40 hours a week should not be too tough.
If you can determine why the current job tires you to such an extent you may find clues that help you answer your own question. Are you stressed from things like office politics, pace of work (constant tight deadlines, etc.), commute? If you can pinpoint what is causing your current fatigue level you can evaluate the new position to see if it will lessen fatigue despite having slightly longer hours. Sometimes the job itself can be energizing because you enjoy it, conversely one you hate can drain you.