In most countries, it is generally not lawful to fire someone solely because they eat slowly at work, especially if the reason for eating slowly is related to a medical condition, such as an eating disorder. Discriminating against someone based on a medical condition is typically against the law, and employers are usually required to make reasonable accommodations for employees with disabilities or medical conditions, as long as these accommodations do not create an undue hardship for the employer.
However, the specific laws and regulations related to employment and discrimination can vary depending on the country and jurisdiction. It's essential to be familiar with the labor laws and regulations in your specific location.
If you have an eating disorder that affects your eating habits and work performance, it might be beneficial to discuss the issue with your employer or human resources department. You may want to request accommodations that can help you manage your condition while still fulfilling your work responsibilities effectively.
If you believe that you have been discriminated against or unfairly treated at work due to your eating disorder or any other medical condition, you may want to seek advice from an employment lawyer or relevant authorities in your country to understand your rights and options. Remember that open communication with your employer is essential in resolving any issues related to your health and job performance.