Based on PayScale reports, a registered dietitian salary for those working in South Africa is around R107,442 to R669,000 a year. Their median salary is reported to be at R201,747. Dietitians actually receive a basic salary of R61,825 to R581,748 plus a bonus of up to R49,316 from some employers.egistered dietitian salary in the UK. The average salary for starting registered dietitians in the UK, based on Prospects, is Â£21,176 to Â£27,625 per year. Dietitians who are at a specialist level earn Â£25,528 to Â£34,189, while those who are at an advanced level make around Â£30,460 to Â£34,189.