Reactive Hypoglycemia: This condition occurs when the body produces too much insulin after consuming high amounts of sugar, leading to a rapid drop in blood glucose levels. Symptoms include extreme fatigue, sleepiness, and numbness or burning sensations in the hands and feet, which match the described symptoms. The consumption of salt and sugar could trigger such a response, especially in individuals with impaired glucose regulation.

Diabetes Mellitus: Both type 1 and type 2 diabetes can lead to symptoms of extreme fatigue and numbness or burning sensations in the extremities due to high blood sugar levels damaging nerves (diabetic neuropathy). The consumption of high sugar and salt could exacerbate these symptoms.
Hypothyroidism: This condition, characterized by an underactive thyroid gland, can cause fatigue, numbness or tingling in the hands and feet, and could be worsened by dietary factors such as high sugar and salt intake, although the direct link is less clear.
Anemia: A deficiency in red blood cells or hemoglobin can lead to fatigue and weakness. While less directly linked to sugar and salt consumption, anemia could contribute to the overall feeling of fatigue and potentially exacerbate symptoms of numbness or burning if there's an underlying vascular component.

Multiple Sclerosis (MS): Although less likely, MS is a condition that affects the brain and spinal cord, leading to symptoms such as numbness, weakness, and fatigue. It's crucial not to miss this diagnosis due to its significant impact on quality of life and the availability of disease-modifying treatments.
Peripheral Artery Disease (PAD): This condition involves the narrowing of peripheral arteries, which can lead to numbness and burning sensations in the feet and hands, especially after eating a meal high in salt and sugar, which could potentially worsen vascular function.
Vitamin B12 Deficiency: A deficiency in vitamin B12 can cause fatigue, weakness, and numbness or tingling in the hands and feet. Given the potential for severe neurological consequences if left untreated, it's essential to consider this diagnosis.

Friedreich's Ataxia: A rare genetic disorder that causes progressive damage to the nervous system, leading to symptoms such as fatigue, numbness, and weakness in the limbs. While rare, it's a condition that would significantly impact the patient's quality of life.
Erythromelalgia: A disorder characterized by burning pain, heat, and redness in the hands and feet, which could be triggered by eating. It's a rare condition but one that could explain some of the symptoms described.
Pellagra: Caused by a lack of vitamin B3 (niacin), pellagra leads to symptoms known as the "three Ds": diarrhea, dermatitis, and dementia. However, it can also cause fatigue and numbness, making it a rare but potential diagnosis to consider in the context of dietary triggers.