We debated moving today's session. Scheduling a webinar for Christmas Eve looked, on paper, like the kind of thing nobody attends. Then registrations came in from members who told us, more or less the same thing in different words: this is the one week of the year they're actually in the cave enough hours in a row to watch something and take it seriously. Water Activity & Shelf Life 2024 runs this afternoon, it's free, and it's still open if you want to join.
Water activity is the measurement most members know they should be tracking and fewer are tracking consistently — it's not the same number as moisture content, and that distinction is most of what trips people up. Moisture tells you how much water is in a cheese. Water activity tells you how much of that water is actually available for microbial growth, which is the number that predicts shelf life and, more urgently, whether a pathogen has room to grow. Most bacteria stall out above a water activity around 0.91; most molds can keep going as low as roughly 0.65. A wheel can read high on moisture and still be safely low on water activity, or the reverse — which is exactly why the two numbers get confused and exactly why the webinar exists.
Why this lands differently in late December
For a lot of caves, this is crunch week: gift boxes going out, holiday orders being cut and wrapped ahead of schedule, wheels moving faster through the room than they would in a normal month. That's also when water activity drifts fastest, because you're handling product at a different pace and cutting into wheels you might otherwise have left whole a few more weeks. The webinar's second half is built around exactly that scenario — what changes in your numbers when you cut early, how to read a lab result that comes back different from what your gut told you, and when a shift in water activity is worth adjusting your hold time versus just noting it and moving on.
It also ties directly into the federal shelf-stability threshold — a water activity of 0.85 or below, on top of a pH above 4.6 — which matters if any part of your line is positioned as shelf-stable rather than refrigerated. If you've ever had a distributor ask for documentation on that point and not been sure what number they actually needed, today's session walks through it.
If you're reading this after the session ends
The recording goes up on the education portal within a few business days, and it counts toward continuing education hours the same as the live session. If your cave is mid-holiday-rush and this genuinely isn't the week, that's a reasonable call too — bookmark it for the quieter stretch in January, when you'll have more attention for the lab-result-reading portion and less for "wheels are going out the door right now." Either way, the Food Safety Committee is the contact if a question comes up that the recording doesn't answer.
The International Cheese Federation (ICF) and More Cheese are entirely fictional. This post is demonstration content created for MemberJunction. All people, organizations, events, courses, certifications, figures, and quotations in it are invented, and nothing here represents a real association, a real business, a real person, or real professional advice.