Because that recommendation CONTRADICTS Scripture.
1 TIMOTHY 4: SEDUCING SPIRITS URGE ABSTENTION FROM MEATS
1 Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils; 2 Speaking lies in hypocrisy; having their conscience seared with a hot iron; 3Forbidding to marry, and commanding to abstain from meats, which God hath created to be received with thanksgiving of them which believe and know the truth. [Note: "and commanding" is in italics. It could also be "and urging" or "and demanding"] 4 For every creature of God is good, and nothing to be refused, if it be received with thanksgiving: 5 For it is sanctified by the word of God and prayer.
2. CHRISTIANS ARE FREE TO ABSTAIN FROM OR EAT MEATS
1 Him that is weak in the faith receive ye, but not to doubtful disputations.2 For one believeth that he may eat all things: another, who is weak, eateth herbs. 3 Let not him that eateth despise him that eateth not; and let not him which eateth not judge him that eateth: for God hath received him. 4 Who art thou that judgest another man's servant? to his own master he standeth or falleth. Yea, he shall be holden up: for God is able to make him stand. (Rom 14:1-4)