The science behind
every decision.

Adults with ADHD experience a genuine neurological impairment in time perception — not a character flaw, not poor discipline. The internal clock that most people rely on to sense the passage of time functions differently in the ADHD brain, producing what researchers call "time blindness."

How this shapes Fuello: Because ADHD adults cannot reliably sense that hours have passed since eating, Fuello's awareness engine tracks time externally and builds an urgency score without requiring the user to self-monitor. The app does the time-sensing that the brain cannot.

Executive function governs planning, organisation, task initiation, and decision-making — all the cognitive steps required to go from "I should eat" to "I am eating." In ADHD, these functions are impaired at a neurological level due to differences in dopaminergic signalling in the prefrontal cortex.

How this shapes Fuello: Fuello's radical reduction principle — never more than three choices, "pick for me" always visible — directly addresses executive dysfunction. Reducing decision complexity is not a convenience feature; it's a clinical accommodation.

During hyperfocus, hunger signals don't just get deprioritised — they get filtered out almost entirely. This is explained by interoception: the brain's ability to sense internal body states including hunger, thirst, and fatigue. Research confirms that ADHD impairs interoceptive accuracy — meaning people with ADHD may be neurologically less able to feel hunger at normal intensity, not simply too distracted to act on it.

How this shapes Fuello: Because hunger signals cannot be relied upon, Fuello never waits for the user to feel hungry before acting. The awareness engine fires based on time and context — an external interoceptive system for a brain where the internal one is unreliable.

Executive function is a finite resource. By the time an ADHD adult notices they're hungry — often hours after the fact — executive function is already depleted. The cognitive load of deciding what to eat, finding ingredients, and initiating preparation can exceed what's available. This is not a motivation problem. It is a neurobiology problem.

How this shapes Fuello: Fuello fires before the collapse, not after. The nudge arrives while executive function is still available. When it arrives late — crisis mode — the app defaults to zero-decision options: no-cook meals, one-step options, "pick for me."

Blood sugar stability is particularly important for ADHD brains because glucose is the primary fuel for the prefrontal cortex — the region most impaired in ADHD. Simple carbohydrates cause rapid glucose spikes followed by crashes that worsen inattention, irritability, and executive dysfunction. Complex carbohydrates with protein slow glucose absorption and provide sustained fuel.

How this shapes Fuello: Three recipes in the library (instant noodles, plain rice, sugary cereal) were flagged during validation as blood sugar spike risks. Their recipe notes were updated to guide users toward protein additions that stabilise the glucose response — without removing the recipes, which remain valid for crisis-mode eating.