Some patients were not given physical assistance to eat their meals, the Care Quality Commission (CQC) has found.
The CQC was reviewing Barnsley Hospital Foundation Trust and Whiston Hospital, part of the St Helens and Knowsley Teaching Hospitals Trust.
One patient at Barnsley Hospital, South Yorkshire, also had an empty urine bottle placed on their table while they were eating.
The criticism levelled at the trusts was revealed as part of the CQC’s England-wide review of care for older people in 100 hospitals.
Last week, it emerged doctors had to prescribe drinking water for patients at one NHS hospital because they were not given enough while others were left unfed.
The latest batch of reports released by the CQC found that some patients at Barnsley Hospital were not given help with eating - with staff unsure about which patients had specific nutritional needs.
The CQC review also expressed concern about the way older people were fed at Whiston Hospital.
Inspectors raised “moderate concerns” about the two trusts, in the CQC’s latest batch of 14 reports - meaning there was good practice on some wards, but not others.
A further two trusts have been told they are meeting standards but must do more to maintain them while 10 hospitals passed inspections.
The two trusts told to maintain their standards were St George’s Healthcare NHS Trust in south London and Sherwood Forest Hospitals NHS Foundation Trust.
The 10 trusts that met all the standards were: University College London Hospitals Foundation Trust, Lewisham Healthcare Trust, Heatherwood and Wexham Park Hospitals Foundation Trust, Kettering General Hospital Foundation Trust, Kingston Hospital Trust, Taunton and Somerset Foundation Trust, Nuffield Orthopaedic Centre Trust, Calderdale and Huddersfield Foundation Trust, North Middlesex University Hospital Trust and York Hospitals Foundation Trust.
A national CQC report on the full audit will be published in September.