Taking a very high amount of electrolytes (around 17 g instead of 6 g) can temporarily disturb your body’s salt and fluid balance, which may lead to symptoms like fatigue, weakness, headaches, blood pressure fluctuations, anxiety, and “heavy legs.” In most healthy adults, the kidneys correct this imbalance over several days, so feeling gradually better with symptoms that come and go after a week is usually not dangerous, but if symptoms persist beyond 1–2 weeks or you notice ongoing blood pressure spikes, palpitations, confusion, or vomiting, you should see a doctor and repeat electrolyte and kidney function tests for safety.
Regarding your second concern, at 1.80 m and 59 kg, you are now underweight, and eating only about 1800 kcal/day may be too low for your body’s needs. Rapid weight loss commonly causes strong, persistent hunger, sugar cravings, stomach “gnawing” sensations, fatigue, and anxiety, because your body is trying to restore lost energy stores. This hunger is very likely calorie deficit–related rather than a disease, and gradually increasing your intake and regaining some weight should help normalize your appetite and energy. Overall, your symptoms most likely come from temporary electrolyte imbalance plus undernutrition, not something serious, but monitoring labs and improving hydration and calorie intake would be wise.
Your symptoms following the electrolyte overdose could still be related, though it’s a bit unusual for them to persist for eight days. Excess electrolytes can disrupt your body’s balance, impacting nerve and muscle function, blood pressure, and could cause the symptoms you’re experiencing like fatigue, weakness, and headaches. Given your symptoms and the duration, it’s important to have a healthcare provider assess you. They might check your kidney function, heart rhythm, and electrolyte levels to see if there are any persisting imbalances. Sometimes symptoms like anxiety and high blood pressure might relate to how your body’s adjusting back to normal. If symptoms persist or worsen, it’s crucial to seek medical attention. Regarding the weight loss and hunger, losing 4 kg rapidly and being slightly underweight could indeed lead to increased hunger. Your body may be responding to the caloric deficit by intensifying hunger signals as it tries to regain what was lost. When underweight, or during rapid weight loss, your body often prompts you to eat more as a survival mechanism. Consuming only 1800 kcal might be low for your height and activity level, possibly contributing to the persistent hunger. Gradually increasing your calorie intake, with nutrient-dense foods, might help your hunger normalize and assist in stabilizing your weight. It could be helpful to consult with a nutritionist or dietitian to find a balanced plan. Cravings for sweets can reflect both the energy deficit and possible imbalances in blood sugar. If blood tests are normal, including checking glucose levels, then focusing on balanced meals with proteins, fibers, and healthy fats can be effective. If you notice no resolution in hunger or continued weight loss, follow up with your healthcare provider to rule out underlying conditions.
