For me personally, I separate truths that do not affect my eternal life from those that are critical to serving Jehovah correctly and gaining an everlasting future. This would be "light truths" compared with "solid spiritual food".
Example: Creation truths could be separated into two categories..."why the sky is blue, which plants came first and on which day (a light truth) compared with "I am a created soul who needs to recognize God as my sovereign and obey his directions" (a solid eternal truth).
Example: The name of Jesus' mother is important historical information (a light truth) but I can gain God's favor and life in the New world without knowing that. But the facts surrounding Jesus coming as my ransomer and savior is critical (solid truth) and I must study and apply that information even to gain access to God, let alone achieve his favor.
As to how to develop an 'appetite' for such good things...well, I have always had a burning desire to 'know' things. It probably was kindled by my parents training me to read. I discovered that treasures of knowledge awaited the diligent student who would take time and effort to study. To read, analyze and inquire about facts (truths) that I discovered and associate with wise and experienced people in the Truth (and some outside) gave me the impetus to continue digging. I now am overwhelmed with sources and tools which I did not have in my youth. I thank our God and his organization every day for these.
You can think of these 'truths' (all of them) as food. You may like some of the light and fluffy side dishes and deserts but your strength and vitality come primarily from the 'solid food' that are the main courses. Learn to focus on the meat and potatoes and save the 'light' chiffon for an added delight...♥️