............ is unstable at cooking temperature, whereas the control of sweetness of food is difficult while using .........

Step-by-step solution

Aspartame is an artificial sweetener that is unstable at cooking temperatures because it decomposes upon heating, which limits its use to cold foods and drinks. Alitame is a high-potency artificial sweetener that is extremely sweet, making it difficult to control the sweetness of food products when used as a sweetening agent. Answer: Aspartame and alitame