The 4pm energy drop is consistent enough to be predictable. Most people who experience it eat a reasonable lunch something with carbohydrates, maybe some protein and then find themselves unfocused and reaching for something sweet two to three hours later. The pattern repeats daily and most people have accepted it as normal.
It is not inevitable.
The mechanism is straightforward. Refined carbohydrates digest quickly and produce a rapid rise in blood glucose followed by a compensatory drop. That drop is what the 4pm crash actually is not tiredness, not low motivation, but blood sugar falling below baseline. The body signals this as hunger and craving for fast energy, which is why the instinct is to reach for something sweet or starchy.
Snacks that contain protein, fat, or fibre digest more slowly and produce a flatter glucose curve. They extend the period of stable energy rather than creating another spike and trough. The difference between a biscuit and a snack built around whole ingredients is not primarily about calories it is about how long the energy lasts and how stable it is.
The practical implication is that what you eat at 11am and 3pm matters as much as what you eat at lunch. Treating snacks as filler between real meals is the thinking that leads to the 4pm crash. Treating them as small nutritional inputs with a specific job changes what you reach for.
This is the gap Brio is built around. Not snacks that are technically less bad than crisps, but snacks that are built around ingredients with a nutritional function protein, fibre, natural energy from whole food sources and designed to actually hold you through the afternoon.