Freeze drying removes water, not fat. That is why high-fat foods often do not freeze dry well. Butter, oils, peanut butter, and chocolate usually stay soft, greasy, or unstable in storage.
Very sugary foods can also be difficult because sugar binds water tightly. Syrups, honey, and some candies may not dry fully or may become sticky.
Dense foods can trap moisture inside. Whole grapes or thick chunks of fruit can look dry outside while holding moisture in the center. Cutting foods into smaller pieces often fixes this.
If you are new, avoid high-fat foods and start with fruits, vegetables, and simple meals. Once you have repeatable results, test harder foods and learn what your machine can handle.
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