How do I stay honest when people don't want to hear the data?

You were trained to follow the science of feeding people, and you keep getting caught between what the data actually says and what farmers and companies want to hear. Telling the truth costs you goodwill; softening it costs you your integrity. That squeeze is real, and it is tiring. This is the old bind of anyone who deals in hard facts among people who would rather not hear them. Your job is not to make the data comfortable. It is to make it clear, and then help people find a way to live with it. The truth does not need you to defend it. It needs you to deliver it honestly and kindly. So work on the how, not the whether. Say the true thing, but say it with respect for what it costs the person hearing it, offer a path, not just a verdict. Some will still resist; that is theirs to carry, not yours. Keep your honesty intact. In the long run it is the only thing that makes you worth listening to.