Tyrimuose dalyvavo 35 sportininkai. Ištirta jų faktinė mityba, energijos sąnaudos ir fizinis išsivystymas. Visi tiriamieji suskirstyti į tris grupes pagal jų sportinį meistriškumą ir treniruotės krūvio dydį. Baltymų kiekis visų grupių vidutiniuose maisto racionuose pakankamas. Dėl labai didelių baltymų kiekio svyravimų individualiuose maisto racionuose (nuo 0,8 g iki 2,8 g kilogramui kūno masės) reikia griežtai individualizuoti baltyminio maisto papildo vartojimą. Daugiausia angliavandenių suvartoja didžiausio sportinio meistriškumo grupės sportininkai. Per didelę viso anglavandenių kiekio dalį (2/3 ir daugiau) sudaro mono- ir disacharidai. Visų trijų grupių sportininkų maisto racione daug riebalų ir cholesterolio. Individualiuose tiriamųjų racionuose riebalų kiekis svyruoja nuo normalaus (94 g) iki 3 kartus viršijančio normalų (295g). Bendras gaunamas su maistu energijos kiekis viršija tiriamųjų energijos išlaidos. Didžiau sią paros energijos dalį sportinei veiklai sunaudoja didelio sportinio meistriškumo tiriamieji - 27,9%, mažiau - 27,2% - vidutinio ir mažiausiai – 16,2% - mažo sportinio meistriškumo sportininkai. Visų tirtųjų sportininkų racionų vitaminų sudėtis nepatenkinama, išskyrus artimą rekomendacijoms vitaminų E, B]2 ir H kiekį. Iš mineralų maisto racionų sudėtyje trūksta magnio, kitų elementų kiekiai atitinka subalansuotos mitybos reikalavimus. Antropometriniai tyrimai rodo, kad reguliariai treniruojantis dideliais fiziniais krūviais racionaliau sunaudojamas gaunamos su maistu energijos perteklius.

Cholesterol concentration in blood did not depend from great cholesterol amount in athletes' nutrition (897 + -16,6 mg) and had week relation with fats (r—0,26), animal fats (r = 0,24) and iron (r = 0,30) amount in ratio, and triglycerides concentration in athletes' blood was dependent from cholesterol amount in the nutrition.

We examined their height, body mass and its components, optimal body mass and the limits of optimal body mass. Factual nutrition was determined by the method of questioning and weighing. It was evaluated food ration chemical composition from average food sets. The high performance athletes’ physical performance was adequate to the represented sports and differs marginally during the study year. The factual nutrition of the athletes was found to satisfy the energetic demands of their body. All studied representatives from different sports received the sufficient protein amount (from 1,7 to 3,6 g/ kg body mass). Administrating food supplements without combining them to factual nutrition raise the disbalance among the proportions of protein, fat and carbohydrates. Food supplements highlighted the disbalance among the amino acids and showed the Metionine deficiency in all subjects food ration. Factual nutrition of athletes meets their energetical needs. Pronounced disbalance of nutritional elements in average nutritional ration is evidenced by sufficient amount of proteins, too high amount of fat, and too low amount of carbohydrates and shortage of polysaccharide carbohydrates. The supplements consumed by athletes raise their vitamin composition in daily food ration more then 10 times, comparing to well-balance nutrition formula.

The majority of the investigated persons overrate importance of proteins in their nutrition, they especially put importance on protein food supplements and constantly use them even having inadequately great amount of proteins in their daily nutrition – up to 3.6 grams for a kilogram of body mass. Proteins enriched energy intake compile in average 14.3 percent of athletes‘ daily nutritional energy. Athletes receive too little carbohydrates, the main energy nutritional substance. Mono and disaccharides are enough and even too much, however slowly intaken polysaccharides are lacking. Athletes received 43.8 percent daily energy with carbohydrates. General amount of fat in all investigated ratios was great, individual indices deviated from 98 g to 310 g. Energy, received together with fats, compile 41.9 percent of athletes‘ daily average nutritional energy intake. Imbalance between alimentary substances is shown also by quantity relation among proteins, fats and carbohydrates in factual ratio, which is 1:1,3:3,1. Athletes‘ energy amount with food intake (from 41,6 kcal/kg to 70,7 kcal/kg, in average 54,5 kcal/kg) completely covered their daily energy expenditures. Analysis on athletes‘ food ratio and their physical development different features interrelations showed that body mass and muscle mass were in strong relation with general proteins amount (r=0,41 and r=0,43), with animal proteins amount (r=0,48 and r=0,51), weak relation with food ratios energy value as well as with amount of carbohydrates and fats in it, and body fats mass was in weak relation only with animal proteins and energy value, did not depend on fats and carbohydrats and amount of their components in nutrition.

indices correlation has revealed that body mass as well as its components (fat and muscle mass) does not have reliable links to energy supplying nutrients in food ration. Interdependence tendency exists between height and nutrients; food rations energetic value only depends on height.

Physical development of high-performance winter sports athletes must be optimal, and with proper diets athletes must ensure an increased their body’s needs for essential nutrients. Only a scientific evaluation of the athletes’ nutrition status provides the opportunity to adjust, optimize and personalize their diets properly. The aim of the present research was to assess nutrition status (3-day food records), physical development for high-performance Lithuanian skiers and biathletes. Research on the athletes nutrition status and physical development was carried out in the preparatory competition period in 2013. The sample included skiers (n = 14) and biathletes (n = 20). The results showed that nutrition profile of Lithuanian elite skiers and biathletes determines an optimal physical development of male athletes and a moderate physical development of female athletes. Nevertheless, nutrition status of skiers and biathletes does not meet the requirements. This is confirmed by the data that protein intake of athletes does not meet the guidelines, their diets lack carbohydrates and there is too much fat. It was found that the athletes’ nutrition status depends on gender. Male athletes’ diets do not contain enough carbohydrates, polyunsaturated fatty acids (omega-3 fatty acids and omega-6 fatty acids), vitamin D and contain too much protein, fat, saturated fatty acids and cholesterol. On the contrary, the energy intake of food does not cover the energy expenditure of female athletes, their diets lack carbohydrates, protein, non-essential aminoacid phenilalanine, omega-3 fatty acids, vitamins D, A, B1, B2, B12, folic acid and minerals potassium, calcium, phosphorus, iron, copper and zinc. In conclusion the nutrition of high-performance winter sports athletes in Lithuania must be optimized, individualized and adjusted according to the gender. Special attention must be paid to nutritional care of female athletes, which nutrition profile does not meet the requirements and can‘t stimulate maximal adaptation of the body to long-lasting and (or) highintensity physical loads.