For many in Hong Kong, the refrigerator is the default sanctuary for preserving everything from multivitamins to avocados. However, Taiwanese nutritional medicine expert Dr. Liu Bo-Ren challenges this assumption, identifying a fridge’s internal environment—specifically its fluctuating humidity and temperature—as a primary cause of premature spoilage. In a recent social media advisory, Dr. Liu shared a definitive storage guide to help households avoid costly, common errors.
The Supplement Trap: Condensation is the Enemy
Dr. Liu notes that patients frequently arrive at his clinic asking if refrigeration keeps their vitamins potent. His surprising answer is generally no. Most tablets and capsules—including vitamins, minerals, and standard supplements—are formulated for stable room temperature storage, typically around 25°C.
The real problem lies in the frequent opening and closing of the fridge door. This creates condensation inside supplement bottles. Because supplements are highly hygroscopic, this moisture accelerates their degradation, causing capsules to stick together or even grow mold.
The correct approach: Store them in a cool, dry, dark cabinet. The only exceptions are probiotics explicitly labeled “keep refrigerated” and opened liquid supplements like fish oil, which genuinely benefit from cold to prevent oxidation.
Coffee and Tea: Vulnerable Odor Sponges
Many assume coffee and tea stay fresher when chilled, but Dr. Liu warns otherwise. The porous nature of these items makes them highly susceptible to absorbing strong refrigerator odors and excess moisture. Once opened, they should be transferred to an airtight, opaque container and kept in a cool, dry spot.
The sole exception is an unopened vacuum-sealed pack intended for storage longer than six months. Even then, a critical rule applies: the package must return fully to room temperature before opening. Failure to do so causes immediate condensation on the beans or leaves, rendering the entire batch unusable.
Chilling Injury: Why Some Produce Hates the Cold
When it comes to fruits and vegetables, Dr. Liu explains that not all produce is cold-tolerant. Some suffer from “chilling injury” when refrigerated. Items to keep out of the fridge include:
- Root vegetables: Potatoes, onions, garlic, sweet potatoes, and pumpkins. Cold temperatures can trigger sprouting and accelerate rot.
- Tropical fruits: Bananas, tomatoes, and avocados. Refrigeration halts the ripening process and can cause the skin to blacken prematurely.
Items that fare better in the fridge include leafy greens (best wrapped in paper or newspaper to maintain moisture balance) and cut or chopped fruits.
The Golden Rule: The 70 Percent Limit
Beyond individual item storage, Dr. Liu emphasizes a universal principle often overlooked: the 70 per cent rule. A refrigerator crammed to the brim prevents proper cold air circulation. This creates temperature inconsistencies and “warm pockets” where bacteria thrive, defeating the very purpose of refrigeration.
Keeping the fridge organized and moderately filled is not just more energy-efficient—it is a fundamental strategy for food safety, nutrient preservation, and waste reduction.
Dr. Liu’s expert guide serves as a powerful reminder that effective food preservation relies on knowledge, not instinct. As Hong Kong households battle the subtropical climate, understanding the specific needs of stored goods is the first step toward a healthier, more sustainable kitchen.
Source: Functional Medicine Nutrition Expert Dr. Liu Bo-Ren