Flocculation appears to be the main aggregation process occurred in the mixes, regardless the homogenisation pressure applied. In the ice creams, coalescence and partial coalescence are the main fat destabilisation phenomena suggested for the UNH and both the homogenised (CH and HPH) systems, respectively. Therefore, it seems that in ice cream high pressure homogenisation did not cause a different structure of destabilised fat globules with respect to the conventional treatment. It is suggested that high pressure homogenisation may have a structuring effect on the proteins of the serum phase. These proteins may form a network rearrangement or interpenetrating network, which may not allow a different fat destabilisation between CH and HPH treatment. This appears to be confirmed by the overrun, melting rate and hardness behaviours. In fact, the HPH ice cream samples with high fat content were characterised by lower overrun, the highest hardness and an improvement in melting resistance. On the other hand, with respect to the CH samples, the HPH ice creams with low fat content showed higher resistance to meltdown, but were not clearly differentiated for hardness.