Final answer:
According to Fernandes et al. (2020), energy drinks were consumed in large amounts.
Step-by-step explanation:
In Harvard referencing, the correct in-text reference, at the beginning of a sentence, for the article 'Case report on energy drink consumption among Health Sciences University students in Gauteng Province, South Africa' by Lucy Fernandes, Kebogile Mokwena and Busisiwe Ntuli, published in Public Health Reviews in 2020, is:
According to Fernandes et al. (2020), energy drinks were consumed in large amounts.