This study investigates the relationship between dietary fat consumption and mental health in a healthy Israeli population, addressing a gap in research regarding the effects of specific fats—Omega-3, saturated fats, and trans fats—on mental well-being. Despite existing studies on general eating patterns and mental health, limited research focuses on these specific dietary fats within this population. A sample of 98 participants was analysed using a correlational design and measures, including nutrition and psychological self-reported questionnaires. Results revealed that higher consumption of trans fats was significantly associated with increased depressive symptoms, with depressive scores significantly higher in those with a high trans-fat intake (M = 16.67, SD = 5.81) compared to those with lower intake (M = 10.25, SD = 4.95). Additionally, the interaction between trans-fat consumption and PUFA/SFA ratio significantly predicted depressive scores (β = 10.86, p < .001 for high PUFA/SFA ratio; β = 3.77, p < .001 for low PUFA/SFA ratio). Similarly, higher trans-fat consumption was linked to increased anxiety symptoms, as indicated by anxiety scores (β = 12.08, p < .001 for high PUFA/SFA ratio; β = 5.22, p < .05 for low PUFA/SFA ratio). Conversely, consumption of saturated fats did not significantly affect mental health, though interactions with PUFA/SFA ratios were noted (β = .14, p < .05 for high PUFA/SFA ratio). The study highlights the complex relationships between different types of fatty acids and mental health, contributing to a deeper understanding of how specific dietary fats impact mental well-being. These findings suggest potential avenues for nutritional interventions to improve mental health, mainly by reducing trans-fat intake.