Hypoglycemia (Reactive): This condition occurs when blood sugar levels drop after consuming a snack, especially one high in sugar, leading to an insulin surge. Symptoms can include dizziness, tingling sensations in the extremities, and are a common reaction in people with or without diabetes.

Anxiety or Panic Attack: Anxiety can cause dizziness and tingling sensations, especially if the individual is experiencing a panic attack. The symptoms can be triggered by various factors, including the consumption of a snack, especially if it's high in caffeine or sugar.
Vasovagal Syncope: This condition involves a sudden drop in heart rate and blood pressure, often triggered by stress or certain foods, leading to dizziness and potentially fainting. Tingling in the feet could be a precursor to or part of the episode.
Food Intolerance: Intolerance to certain foods (e.g., gluten, lactose) can lead to a variety of symptoms, including dizziness and tingling sensations, after consumption.

Diabetic Neuropathy: Although less likely as an immediate reaction to a snack, if the patient has diabetes, neuropathy could cause tingling in the feet. Dizziness could be related to blood sugar fluctuations.
Cardiac Issues (e.g., Arrhythmias): Certain heart conditions can cause dizziness and potentially tingling sensations in the extremities due to reduced blood flow. These conditions are critical to identify due to their potential severity.
Multiple Sclerosis or Other Neurological Conditions: While less common, conditions like multiple sclerosis can cause a wide range of neurological symptoms, including tingling and dizziness, which could potentially be triggered by eating.

Pellagra: A disease caused by a lack of vitamin B3 (niacin), characterized by dermatitis, diarrhea, dementia, and potentially death if left untreated. Early symptoms can include tingling sensations and dizziness.
Epilepsy (with aura): In some cases, individuals with epilepsy may experience an aura before a seizure, which can include tingling sensations or dizziness. This would be an unusual presentation but should be considered in a differential diagnosis for unexplained neurological symptoms.
Heavy Metal Poisoning: Exposure to certain heavy metals (like mercury or lead) can cause neurological symptoms, including tingling in the extremities and dizziness. This diagnosis would be considered if there's a known exposure history.